Create action that emulates animator component's "setup fields by name" behavior

[mpmxyz]

What is the reason for this feature?
The default linking of outputs is convenient for quick tests but may hide naming inconsistencies between timelines and the slots they are supposed to drive.

Describe the solution you'd like
There should be actions to:

• unset all playback slots
• set all null playback slots to the recorded slot
• emulate "setup fields by name" with a slot as an argument to fill null override all playback slots

Note: Property probes will not be touched because there is no reflective access to component properties (Yellow-Dog-Man/Resonite-Issues#57) AND linking Animators to component properties is broken (Yellow-Dog-Man/Resonite-Issues#683).

[mpmxyz]

This feature has been mostly implemented with a quick&dirty UI element where you drop the root slot in. That would make the setup code run and reset the input for the next action.
I may change it to a more traditional input + button form during the review phase because it looks like using the same parent multiple times per recording session may be the preferred way of interacting with it.