max chen a20dc348ee Sequencer: Pre-Animated state changes to support track instance inputs ...

- Track Instance Inputs can now be used as capture sources to capture pre-animated state
  - PreAnimatedState extension now simply exists as a member of UMovieSceneEntitySystem. Previously the existence of the extension was used to determine whether any pre-animated state logic was required, but in practice this created more problems than it solved and led to some convoluted lifetime management code.
  - Added a templated group manager type from which the object group manager can inherit. This simplifies the introduction of new group managers
  - Removed the requirement that all pre-animated state must exist as part of a valid group. This forced state from 'master' tracks to be arbitrarily grouped together which put an unnecessary burden on the storage classes.

#jira UE-132512
#rb max.chen, matt.hoffman
[FYI] andrew.rodham
#preflight 61f2ca893765218cf01f290e

#ROBOMERGE-AUTHOR: max.chen
#ROBOMERGE-SOURCE: CL 18754810 in //UE5/Release-5.0/... via CL 18754825 via CL 18757520
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v903-18687472)

[CL 18758489 by max chen in ue5-main branch]

2022-01-27 14:35:51 -05:00

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