To make the order of elements deterministic. Using memory address based objects
as map key makes order of elements there nondeterministic. Later it can be
replaced with vector when there are no indirect munipulations with container
inside iteration loops.
Change map key to const MWWorld::LiveCellRefBase* to avoid erasing and inserting
elements on MWWorld::Ptr update.
Store CharacterController by value instead of pointer to avoid redundant memory
allocation.
This is mostly propogating the error up the stack so the game can do something about it.
Working on avoiding log spam from calling an animation that doesn't exist every frame.
