Update icons almost automatically updated to have correct gradient

[HansOlsson]

Primarily done using a new flag of updateModelicaAnnotations in Dymola.
But Modelica/Electrical/Machines/Icons/(Quasi|)StaticTransformer.mo was also manually converted to be more line-based texts (makes future changes more logical), and some part of Modelica.Electrical are missing here - need to investigate.
Closes #3951

[HansOlsson]

For TwoPort and FourPort I believe the gradients were a plain mistake, and removed them.

[casella]

I'm not really sure what this is all about, am I supposed to know?

[HansOlsson]

I'm not really sure what this is all about, am I supposed to know?

Perhaps, the change in Modelica.Fluid.Vessels shouldn't change the diagrams seen in Modelica.Fluid.Examples.AST_BatchPlant.BaseClasses.TankWith3InletOutletArraysWithEvaporatorCondensor
Modelica.Fluid.Examples.AST_BatchPlant.BaseClasses.TankWithTopPorts
for Dymola; and possibly make it look better in other tools.

[HansOlsson]

To clarify for @casella @christiankral it is intended to solve the #3951 that found that

Some classes have Icon annotations where there is a fillPattern which should give a gradient, but they have lineColor explicitly equal to fillColor which results in a solid fill instead.

In Dymola such classes are rendered as if lineColor is black which gives a good visual gradient, and this PR just changes to use black lineColor instead (except some that shouldn't have gradient).

[HansOlsson]

If you use Dymola and you don't see any change in

@casella

• Modelica.Fluid.Examples.AST_BatchPlant.BaseClasses.TankWith3InletOutletArraysWithEvaporatorCondensor (icon has tank with gradient)
• Modelica.Fluid.Examples.AST_BatchPlant.BaseClasses.TankWithTopPorts (icon has tank with gradient)

@christiankral @AHaumer

• Modelica.Electrical.Machines.BasicMachines.Components.PartialAirGapDC (icon has bar with gradient)
• Modelica.Electrical.Machines.BasicMachines.Transformers (icon has bars with gradients)
• Modelica.Electrical.Analog.Interfaces.FourPin (diagram has arrows - they should be solid, no gradients)

etc you can accept it.

For other tools it may be the same, or the older version may lack the gradients (for the ones that should have them).

[christiankral]

I checked the electrical and magnetic icons and they all look good.