Logic was broken into finding gaps and ofsetting strips.
Functions were modified so they work on explicitly defined seqbase,
so they can be used as python API functions.
Functional changes:
- Improve performance by calculating gap length and offseting strips
at once. Previously strips were offset by one frame.
- Calculate gap from start frame. Previously gap was considered only
inbetween strips.
Reviewed By: sergey
Differential Revision: https://developer.blender.org/D9730
Code was rewritten to work on per-sequence basis returning reference to
created strip.
There should be no functional changes.
Selection logic is left as is for now. I could simplify it, but it
belongs to operator, not split logic.
Reviewed By: sergey
Differential Revision: developer.blender.org/D9592
Move most functions into separate files.
File sequencer.c is reserved for alloc, free and duplicating functions.
There should be no functional changes.
