Line scriptable options

[etimberg]

Background

This PR introduces scriptable configuration options for points on line charts. The user can script the styling and interaction options.

Testing

The existing unit tests covering the setHoverStyle dataset controller method were removed as they did not have proper setup for use with scriptable options.

Fixture based tests were written to test:

• pointBackgroundColor
• pointBorderColor
• pointBorderWidth
• pointRadius
• pointRotation
• pointStyle

Documentation

I updated the line chart documentation to match the style of the bubble & bar charts. It may be a good idea to split the Styling section of the documents into Line Styling and Point Styling. If there is agreement on that change I can go ahead and make the update.

[nagix]

It may be a good idea to split the Styling section of the documents into Line Styling and Point Styling.

I agree this because it is a long list and Line Styling and Point Styling options fallback differently.

[etimberg]

I quickly split the table into two sections: Point Properties and Line Properties. I will edit the copy again this evening.

[simonbrunel]

@etimberg I would not split the options table which gives a complete overview of all the dataset options but I would split only the styling section (Line Styling and Point Styling as you suggested).

[simonbrunel]

Awesome work @etimberg, thanks!