Add configuration of colors for clip types (video, audio, title, image, slideshow)

Yash Bavadiyarequested to merge
xevrion/kdenlive:feature/configurable-clip-colors into master

Adds settings to set colors for clip types (video, audio, title, image, slideshow), by default they're shown as transparent (checkerboard)(which means the default hard-coded colors).

I'm open to suggestions regarding the transparent (checkerboard) default color for different clip types.

Fixes #2146 (closed)

Edited by Yash Bavadiya

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