Added commandline options for specifying custom prefix and filename and also to autorun
/gui --> runs GUI mode
/p [prefix] --> specifies the prefix. UserData filename will be "[prefix] - modelid.txt"
/f [filename] --> specifies the prefix. UserData filename will be "[filename].txt"
/map [filename] --> autorun map of "[filename].txt" and exit
/unmap --> autorun unmap and exit
/dumpkeys --> autorun dumpkeys and exit