merge things
slight updates.
Rewrite inner loop.
Add test data.
Rewrite clip function.
This branch is very out-of-date.
Independent clip movement.
rewrite "start frame" handling
update README
Delete lots of things.
update README
stuff and things
Remove 2.1.X support and delete more stuff.
update README
Working pos and fsc[xy].
rewrite remaining motion functions (rotation still broken)
Fix rotation
Add rotation
Fix some dumb stuff.
Finish multiple block support.