UI: Add Multiview projector

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Jim note:

- Refactored code significantly
- Added a context menu option to exclude specific scenes from projectors
- Made it so multiview projectors update when scenes are
  added/removed/renamed
- Increased text quality
- Removed the color sources and replaced them with simple solid
  rectangles
- Increased the border size of "program" and "preview" scenes in the
  lower scene list

Closes jp9000/obs-studio#1068

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