Blender Git Loki

NLA SoC: Start of integration of Meta-strips in Transform

* Chains of selected strips are now converted to meta-strips before transforms begin, and converted back afterwards. This simplifies the transform code needed in later stages...

* Transform-flushing code for Meta-Strips should now work. There seems to be a little bit of numeric inaccuracy problems somewhere, as two strips which met at the same frame can get separated when scaling.

* Meta-strips now draw with proper text identification

* Snapping strips now properly clears meta-strips if a moved strip needs to be moved into a new track to be accomodated.

* Fixed a filter used by a selection-operator.