bool sgFileManager::Save(const sgCScene* scen, const char* file_name,
const void* userData, unsigned long userDataSize)
Saves a scene to the file of the specified structure with user-defined block of data (read more how to save the scene here).
scen - scene to be saved
file_name - full path to a file the scene will be saved to
userData - user-defined block of data which is saved right after the header in the file (can be NULL)
userDataSize - user-defined block of data size (ignored if userData is NULL)
Returns true if the scene was successfully saved, otherwise - false