add an profiling example, and optimize a couple small things.
switch to LuaGlueSymTab in more places. getting ready for the classidx lookup optimization
Iterations: 300000, Time Elapsed: 219.17s
optimize out all of the dynamic_casts, most of the linear searches for classes, and some type checking. upwards of 37% inprovement.
add back runtime type checking under a #ifdef guard. defaults to disabled.