EMI: Load default room image when missing a background bitmap. Fixes #881.
Merge pull request #882 from JoseJX/FixMissingBackgroundSegfault

EMI: Load default image when missing a background bitmap. Fixes #881
ALL: synced with ScummVM
ALL: Fix merge
EMI: Add a stopWalking() call to ActorStopMoving. Fixes #880.
Merge pull request #884 from JoseJX/AddActorStopMoving

EMI: Add a stopWalking() call to ActorStopMoving. Fixes #880.
EMI: Added support for animation priorities and implemented blending.
EMI: Never stop the rest chore.
EMI: Fade chores if PlayChore/StopChore specifies a fade time.
EMI: Fade talk chores.
EMI: Fixed talk chore index 0 being ignored by SetActorTalkChore.
EMI: Implement rest of animation component keys.
EMI: Chore fading fixes.

Fading out chores remain in playing state until they have completely faded out. Also using StopChore on a fading out chore will actually stop the chore, unlike in Grim where the chore will keep fading out.
EMI: Never fade rest chores.
EMI: Fixed implementation of AdvanceChore.
EMI: Fading tweaks.
EMI: Formatting and code cleanup.
EMI: Do not sort playing chores.

Now that animation priority is taken into account, sorting the chores is no longer necessary since the playing order does not have any effect on the animation.