Parameters
const char[] path
Path to create. Note that directories are not created recursively unless use_valve_fs is used.
int mode
Permissions (default is o=rx,g=rx,u=rwx). Note that folders must have
the execute bit set on Linux. On Windows, the mode is ignored.
bool use_valve_fs
If true, the Valve file system will be used instead.
This can be used to create folders in the game's
Valve search paths, rather than directly in the gamedir.
const char[] valve_path_id
If use_valve_fs, a search path from gameinfo or NULL_STRING for default.
In this case, mode is ignored.