Wrapped classes: Avoiding redundant initialization of the "class table".
Wrapped classes: Avoiding redundant initialization of the "class table".

Until now, the LuaValueMap that represents the metatable of exported
classes on the C++ side was initialized every time the class was
registered into a Lua state. Now, this is done just the first time.

This seems to fix the crash reported by James Doherty, though I really
don't understand why. (Fixes the crash under Linux; James reported the
problem while working on Windows.)

lmbarros/Diluculum