running "script_client" from main menu would cause an access violation when attempting to access m_hVM from the CSquirrelVM instance for the client vm, which has not been created by this point
The game uses 2 types, CSquirrelVM (mostly exposed to the VScript API of the engine) and HSQUIRRELVM (mostly used for internal squirrel functions like sq_pushbool etc..).
This refactor properly splits the CSquirrelVM* functions from the HSQUIRRELVM (SQVM*) ones. The functions have also been renamed accordingly and the prototypes have been adjusted to use the correct pointer type.
