Added patch by Matt Ebb, that enhances the sequencer GUI in several ways: - It looks a lot better - Strip colours are themeable. - The drawing code is more readable. - The background of the timeline makes now distinguishing the channels easier by alternating between different shades of gray. - Handle-scaling is clamped to min and max-values, making it possible to grab strips at large zooming levels more easily. - Preview-images can be panned by dragging it with the middle mouse button. Home-Key resets the position. - Since some people can't grab the meaning of "C 0", it is renamed to "Chan: 0" - Effect strips have slightly different colors to distinguish them better. Additionally: - fixed an off by one error in Matt's patch - Scene-rendering saves CFRA to avoid jumping current-scene on scrub (might be academic fix, since most likely it only happens if you add the sequencer-scene to the timeline... But nevertheless it bugs you on testing the GUI ;-)