This is needed for synchronization: motions will have to start
(with a specific start time offset) from a point in the code where
only the motion object is available.
I added/used LLMotionController& in a previous commit, this was
now changed into a pointer. There is (obviously) not much reason
for that, but also no disadvantage: the diff relative to LLs code
doesn't get larger since the references where already added, too.
Conflicts:
indra/llcharacter/llkeyframemotion.cpp
indra/llcharacter/llkeyframemotion.h
