CMakeLists.txt: define LOGGING_SUPPORT_DISABLED so that MathGeoLib's and kNet's logging macros don't clash.
qscript_*.cpp: fix unreferenced formal parameter warnings.
Comment out the MathGeoLib LOG* macros for good (LOGGING_SUPPORT_DISABLED doesn't remove them, but makes them no-op). Replace the few LOG* calls in MathGeoLib with printf.
Add null pointer checks to EC_Mesh's and EC_Placeable's AttributesChanged functions. Couple other warning fixes while at it.