Added more sanity checks Added lua_matproxy_nobindmat & matproxy changes The convar is for testing only (since not all servers have the updated Lua library), Lua mat proxies will reuse the already stored material in Lua for the bind callback, rather than pushing the stored material from C every frame. This prevents thousands of IMaterials being pushed to Lua a second, and should prevent hitching when GC deletes them all in batches.