Wrapped gSettings and the global objects returned by Settings::get() and
Globals::get() in AIThreadSafe, forcing thread-safe access.
This solves the problem of possible corruption of the various LevelMap's
in LLError::Settings due to thread unsafe accesses.
-Fixed pine2 'billboard' being crazy large compared to the mesh version
-Fixed vanishing trees under certain scenarios
-Made LoD less retardedly sensitive when RenderAnimateTrees=true
-Moar LLCachedControl