UI: unified EFX and RGB Matrix editor 'Test run' look & feel
Updated EFX and RGB Matrix editor documentation.

Turned every "colour" into "color"
RGB Matrix: consider overridden fade-in time (e.g. when in a Chaser)
Check address availability also when fixture mode changes.
Scene Editor: use channel's primary color to determine color tool availability (instead of channel name)

fix unit tests
Engine: It is now possible to set a network URL on videos

Engine: removed Qt widget dependency
Engine: Moved video widget code into a new UI class called VideoProvider
Engine: fixed universe passthrough flag not restored on project load
VideoProvider: added missing cleanup code
Fix changelog
update changelog
Merge pull request #413 from plugz/changelog

update changelog