StickyPy bug fix and refactoring.

The bug was that whenever we right click on a vertex after selecting many,
it would deselect all but the selected vertex. We would like to insert
keys for all selected vertices...
Add support for smoothstep interpolation
StickyPy animation playback bugfix

After we switched the animation editor to its own local coordinate frame,
some bugs were introduced during playback... Namely, we were setting the
incorrect camera position that was used as an offset during rendering.
Added idle animation
Don't laugh at me