some fix for SH-4416: Interesting: memory footprint is larger when loading from cache while ObjectCacheViewCullingEnabled is enabled than when it's disabled.

another attempt to move mem stat into base class

moved occlusion culling earlier in login process

made sceneloadingmonitor setting not persist

set enabled flag before calling freeze scene

further optimizations for codegen

in particular, created shortcut overloads for conversions and moved
comparison operators into member functions

changed unit declarations macros to make a lot more sense

manipulation of callsite strings in llerror

forced unit conversion code to inline
unit conversion now no longer converts all the way to base and back, but tries
to find equivalent units as early as possible
fixed another llinfos instance
scene monitor now outputs n/a for invalid samples