Blender Git Loki

Movie Clip Editor: cleanup of display panels

- Split display options into two panels:
* Display, which contains all general display options related on editor itself
* Marker Display, which contains options which makes sense for markers themselves
and not used so often.
- Remove Show GPencil option which doesn't actually make sense because strokes might
be disabled from GPencil panel
- Removed Show Pyramid option and show pyramid for KLT tracker as default.
- Added hotkey to toggle Show Disabled (Alt-D)
- Added hotkey to toggle Show Pattern (Alt-S)

Changes in interface and hotkeys are done by Sebastian Koenig.
Thanks for the patch!

Own changes in interface were related on Aspect Ratio. It doesn't make
much sense for tracking (camera pixel aspect is what you'll want to use,
but for masking it would make much more sense because when you just
want to create a mask for footage you don't actually have camera).
Just removing from interface seems not so nice for now.