[v18.51 - Game Laucher] Setting of the saved games path

[Cwell]

Whatever path you set, the game will use <systemdrive>:\Users\<user>\Documents\Xenonauts to store saved games and user's key-mapping.

It probably needs to be set/saved in the base gameconfig.xml, not the user's light version with key-mapping, so you could actually find it on start-up

If you're planning on doing it instead of removing the launcher button, force the addition of a "\SavedGames\" or something, so that we don't end up with those files straight in the Xenonauts directory.