Blender Git Loki

Fix T82210: Animation, Bake Action cleanup

Make post-bake cleanup of the Bake Action operator optional, and disable
by default.

Previously Bake Action would do two things:
- Bake the Action
- Clean up the FCurves

It is now possible (and even the default) to only perform the baking
operation.

Reviewed By: #animation_rigging, looch, sybren

Maniphest Tasks: T82210

Differential Revision: https://developer.blender.org/D9453