adding AnimationAlembicLoader support into LayoutLoader

[Almie]

Changelog Description

This PR is to add support for importing alembic animations into Unreal when they are included in a layout as part of the load layout step.
Fixes #185

Additional review information

Although the alembic animations in the layout will now be loaded, they are not yet added to the corresponding LevelSequence.

Testing notes:

1. Publish a layout containing an animation with an abc representation.
2. Launch Unreal
3. Load layout
4. Alembic animation should be loaded

[LiborBatek]

The animation alembic pointcache got loaded into content folder next to the layout but is not added in the ue level. Im not talking about the sequencer as its noted in the PR description (that its not supported aka automatically added to it atm)

Here is my layout ue map and content browser with loaded pointcache animation.

I guess we miss the pointcache in the ue level atm....aka current issue.

P.S. I have manually added the pointcache to the active ue layout level....thats why its visible and there...

[moonyuet]

The animation alembic pointcache got loaded into content folder next to the layout but is not added in the ue level. Im not talking about the sequencer as its noted in the PR description (that its not supported aka automatically added to it atm)

Here is my layout ue map and content browser with loaded pointcache animation.

I guess we miss the pointcache in the ue level atm....aka current issue.

P.S. I have manually added the pointcache to the active ue layout level....thats why its visible and there...

I guess this is missing because it doesn't import the animation.
You can steal some codes from the inventory action for connecting animation to sequence