Added four Visualizer colormap function and png files

[smathimech]

This MR address this issue #4689

Changes:

• Added four different colormap function for visualizer.
• Conversion script not requires (adding new function).

[CLAassistant]

All committers have signed the CLA.

[smathimech]

This is my first contribution to this modelica repository. I'm part of Modelon, India. I hope that, signed the CLA correctly.

[thorade]

Mathi, thanks for adding these colormaps. You used two email addresses while committing, can you add the second address also to your github profile?

The existing colormaps are all in this overview/comparison, maybe the new maps could be added there as well?
https://github.com/modelica/ModelicaStandardLibrary/blob/master/Modelica/Resources/Images/Mechanics/MultiBody/Visualizers/Colors/ColorMaps/ColorMaps.png

[smathimech]

Since i don't the original source file of this colormap, it's quite difficult to get similar represenations. Let me know, if this need to improved further.