lmd_actor attributes
Related tasks:
- Added "ModelScale" "TorsoAnim", and "LegsAnim" keys to lmd_actor entity.
- Added "Skin" key to lmd_actor entity.
- Added "Speed" key to lmd_actor entity. For use with future lmd_actor_* movement control entities.
- Added "NPC_TargetName" key to lmd_actor entity. For use with future lmd_actor_* entities.
- Began working on lmd_actor movement control.
- Added "lmd_actor_modify" entity. Identical to lmd_actor, but modifies existing actors based on its "NPC_Target" key.
- Started on actor movement code.
