-Fixed mistakes in LLCachedCOAControl revealed by GCC. Thanks Siana.
-LLCacheControl'd stuff related to postprocessing, which I may mess with later.
GCC... Sigh.
Added LLObjectList::getAvatar(LLUUID) for type-safe and quicker lookup
Added F32 overload to LLSD because using F64 needlessly is silly.
(And its lack of F32 overload caused issues with LLCachedControl<F32>)