Bugs found whilst updating example files.

Below are a list of errors encountered whilst re-factoring the example files to work with PHP 7.

> **Note:** I'll continually edit and update this issue until all examples are tested and committed.

**a1-image-sample.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\Antialias
```
**a1-traps-sample.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\Antialias
```

**bitmap-font.php**
```
Uncaught TypeError: Value 2 provided is not a const in enum Cairo\HintMetrics
```

**caps-joins.php**
```
Uncaught TypeError: Value 0 provided is not a const in enum Cairo\LineCap
```

**caps-sub-paths.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\LineCap
```

**clip-fill-rule.php**
```
Uncaught TypeError: Value 0 provided is not a const in enum Cairo\FillRule
```

**clip-operator.php**
```
Uncaught TypeError: Value 0 provided is not a const in enum Cairo\Operator
```

**composite-integer-translate-over.php**
```
Uncaught TypeError: Value 2 provided is not a const in enum Cairo\Operator
```

**composite-integer-translate-over-repeat.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\Extend
```

**composite-integer-translate-source.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\Operator
```

**dash-caps-joins.php**
```
Uncaught TypeError: Value 0 provided is not a const in enum Cairo\LineCap
```

**dash-curve.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\LineCap
```

**dash-scale.php**
```
Uncaught TypeError: Value 0 provided is not a const in enum Cairo\LineCap
```

**degenerate-arc.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\LineCap
```

**degenerate-path.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\LineCap
```

**degenerate-pen.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\LineJoin
```

**device-offset.php**
```
Uncaught TypeError: Cairo\Surface::createSimilar() expects parameter 1 to be integer, object given
```
```
$s = $context->getGroupSurface();
$c = $s->getContent();
$s1 = $s->createSimilar($c, $size / 2, $size / 2);
```

**device-offset-positive.php**
```
Uncaught TypeError: Cairo\Surface::createSimilar() expects parameter 1 to be integer, object given
```
```
$s = $context->getGroupSurface();
$c = $s->getContent();
$s1 = $s->createSimilar($c, $size / 2, $size / 2);
```

**extend-pad.php**
```
Uncaught TypeError: Value 3 provided is not a const in enum Cairo\Extend
```

**extend-reflect.php**
```
Uncaught TypeError: Value 2 provided is not a const in enum Cairo\Extend
```

**extend-repeat.php**
```
Uncaught TypeError: Value 2 provided is not a const in enum Cairo\Extend
```

**extend-repeat-similar.php**
```
Uncaught TypeError: Cairo\Surface::createSimilar() expects parameter 1 to be integer, object given
```
```
$s = new Image(ImageFormat::ARGB32, 100, 100);
$s->createFromPng(dirname(__FILE__).'/romedalen.png');
$s1 = $surface->createSimilar($surface->getContent(), 320, 256);
```

**fill-rule.php**
```
Uncaught TypeError: Value 0 provided is not a const in enum Cairo\FillRule
```

**finer-grained-fallbacks.php**
```
Uncaught TypeError: Value 2 provided is not a const in enum Cairo\Operator
```

**group-paint.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\Operator
```

**infinite-join.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\LineJoin
```

**large-source.php**
```
Uncaught ArgumentCountError: Cairo\Surface\Image::createForData() expects exactly 4 parameters, 5 given
```
```
$s->createForData($data, ImageFormat::A1, $width, $height, $stride);
```

**linear-gradient-reflect.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\LineJoin
```

**mask-ctm.php**
```
Uncaught ArgumentCountError: Cairo\Surface\Image::createForData() expects exactly 4 parameters, 5 given
```
```
$s = new Image(ImageFormat::ARGB32, 1, 1);
$s->createForData($data, ImageFormat::ARGB32, 2, 2, 8);
```

**mask-surface-ctm.php**
```
Uncaught ArgumentCountError: Cairo\Surface\Image::createForData() expects exactly 4 parameters, 5 given
```
```
$s = new Image(ImageFormat::ARGB32, 1, 1);
$s->createForData($data, ImageFormat::ARGB32, 2, 2, 8);
```

**meta-surface-pattern.php**
```
Uncaught TypeError: Value 0 provided is not a const in enum Cairo\Extend
```

**move-to-show.php**
```
Uncaught ArgumentCountError: Cairo\Surface\Image::createForData() expects exactly 4 parameters, 5 given
```
```
$s->createForData($c[$i], ImageFormat::RGB24, 1, 1, 4);
```

**nil-surface.php**
```
Uncaught TypeError: Argument 1 passed to Cairo\Pattern\Surface::__construct() must be an instance of Cairo\Surface, null given
```
```
$patternSurface = new PatternSurface(null);
```

**operator-clear.php**
```
Uncaught TypeError: Value 0 provided is not a const in enum Cairo\Operator
```

**operator-source.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\Operator
```

**over-above-source.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\Operator
```

**over-between-source.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\Operator
```

**paint-source-alpha.php**
```
Uncaught ArgumentCountError: Cairo\Surface\Image::createForData() expects exactly 4 parameters, 5 given
```
```
$s->createForData($data, ImageFormat::ARGB32, 4, 4, 16);
```

**pdf-surface-source.php**
```
Segmentation fault (core dumped)
```

**ps-surface-source.php**
```
Segmentation fault (core dumped)
```

**random-intersections.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\FillRule
```

**rectangle-rounding-error.php**
```
Uncaught TypeError: Value 1 provided is not a const in enum Cairo\Antialias
```

**rectilinear-stroke.php**
```
Uncaught TypeError: Value 2 provided is not a const in enum Cairo\LineCap
```

**rotate-image-surface-paint.php**
```
Uncaught TypeError: Value 3 provided is not a const in enum Cairo\Filter
```

**scale-down-source-surface-paint.php**
```
Uncaught ArgumentCountError: Cairo\Surface\Image::createForData() expects exactly 4 parameters, 5 given
```
```
$s = new Image(ImageFormat::ARGB32, 100, 100);
$s->createForData($data, ImageFormat::RGB24, 4, 4, 16);
```

**scale-source-surface-paint.php**
```
Uncaught ArgumentCountError: Cairo\Surface\Image::createForData() expects exactly 4 parameters, 5 given
```
```
$s = new Image(ImageFormat::ARGB32, 100, 100);
$s->createForData($data, ImageFormat::RGB24, 4, 4, 16);
```

**set-source.php**
```
Uncaught ArgumentCountError: Cairo\Surface\Image::createForData() expects exactly 4 parameters, 5 given
```
```
$s = new Image(ImageFormat::ARGB32, 1, 1);
$s->createForData($color, ImageFormat::ARGB32, 1, 1, 4);
```

**sphere.php**
```
Uncaught TypeError: Value 0 provided is not a const in enum Cairo\Antialias
```

**surface-check.php**
```
Uncaught Error: Call to undefined function cairo_available_surfaces()
```

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Bugs found whilst updating example files. #29

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Bugs found whilst updating example files. #29

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