Blender Git Loki

Fix T80121: Forcefield F-curve modifier changes don't reset cache

Add a dependency graph relation Force Object Animation ? Scene Rigid
Body World Rebuild. This ensures that the rigid body world is rebuilt
when a force object is re-tagged for animation updates.

The extra relation doesn't add any new calculations when the animation
is running, as the Time Source node already had a relation to the
scene's `RIGIDBODY_REBUILD` node.

The relation is created directly to the `RIGIDBODY_REBUILD` Operation. I
would have liked to target the containing Component instead. However,
that has the `RIGIDBODY_SIM` operation as entry node, which isn't enough
to actually fix T80121.

Reviewers: Sergey

Differential Revision: https://developer.blender.org/T80121