Add an RNA enum property `AnimData.animation_binding` that lists all the
bindings available in `AnimData.animation`.
The list of bindings is filtered to only contain the bindings suitable
for the animated ID. This prevents assigning a 'camera' binding to a
mesh.
Un-assigning is done via an operator, represented as an 'X' button in
the interface.
The enum property contains up to two special items:
- "New" to create a new binding for the ID.
- "(none/legacy)" to indicate that this ID doesn't have a binding
assigned. This one is conditional, and only appears when it is
necessary.
These two special items are experimental, and mostly exist because we're
still evaluating things and building a better UI. It is intended that
the binding selector will become as close to the ID selector as
possible.
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Note that this PR also contains #121268 as it builds up from that one, and I didn't want to wait with testing on the buildbot until that one lands.
The new Baklava panel:
Pull Request: https://projects.blender.org/blender/blender/pulls/121269
10c00b6390