Added UnitAnimation class, to act as the interface between the entity
and actor. (Currently doesn't work very well, but it does make
animations loop smoothly and sometimes kind of makes them stay
synchronised.)
Fixed corpse animation - it now plays the final frame of the death
animation before turning static.
Fixed update/interpolate timings.
Added JS function saveProfileData.
Updated ffmpeg library.
This was SVN commit r4880.
