* the script (so the script gets destroyed when the worldmap is destroyed)
*/
HSQUIRRELVM run_script(std::istream& in, const std::string& sourcename);
/**
* switch to another worldmap.
* the script (so the script gets destroyed when the worldmap is destroyed)
*/
HSQUIRRELVM run_script(std::istream& in, const std::string& sourcename);
/**
* switch to another worldmap.