Decoding for animation blocks

Changes to:
- NiPathInterpolator
- NiBlendInterpolator
- NiBoneLODController
- bhkBlendController
- NiSequence
- NiLookAtInterpolator
- BSProceduralLightningController
- BSAnimNotes

New objects:
- BSAnimNote

New enums:
- PathFlags
- InterpBlendFlags
- LookAtFlags
- AnimNoteType

New compounds:
- InterpBlendItem