Make the Cheats Command Reflect UsedCheats

This merge request makes it so that the cheats command actually tells you if cheats have been enabled, not just if CV_CHEAT console variables have been set. Doing cheats on will now also enable cheats proper and disable saving. This is so that when the game tells you to turn cheats on to do something, such as using the map command in single player, it actually works.

Test exe: cheatonfix.exe

Note that turning cheats on does not currently sync between players. But neither does doing so with the map command as seen in #1118, so I will leave it be for now.