Create a blank persistent.sfs file so we don't bug out "Load Game" on first DMP install (or when the DMP persistent.sfs file is missing).
Added the expireScreenshot function, which will delete any screenshots that are older than a day, and its checks runs every 10 minutes

Server admins can now change the interval of days to set a screenshot as expired
- Settings now supports double values

Changed ScreenshotExpire to static
Added /version command and added DMP version to mainmenu window title
Removed unused imports
Fixed a bug where if your name contains \n or \r, it will throw on Windows