The baseclass library. Used to lookup a field from a metatable.
table baseclass.Get( string name )
Gets the base class of an an object. This is used not just by entities, but also by widgets, panels, drive modes, weapons and gamemodes (with "gamemode_" prefix). The keyword DEFINE_BASECLASS translates into a call to this function. In the engine, it is replaced with: local BaseClass = baseclass.Get