Lots of changes

- Menus now have all of the Kart cvars
- Removed any cvars that aren't useful for Kart from the menu (they
still exist in the console, though)
- Removed SP and NiGHTS Mode options from the main menu
- "kartcc" is renamed "kartspeed", uses values 0-2 instead of multiples
of 50, or the terms "Relaxed", "Standard", and "Turbo"
- Many gametype options (game speed, frantic, mirror, & karma comeback)
are now changed on map load instead of instantly
- New cvar, "kartminimap", for disabling the minimap
- The maxplayers cvar now actually matches up with our 16 player limit
- Game now keeps track of matches played. Has a condition type
associated with it, as well.
- Game checks for unlocks and saves gamedata when finishing a match,
even in MP
- Removed most of the normal emblems, added a single emblem for Green
Hills. Didn't know what to do with extra emblems and such so I just left
them (FOR NOW c:<)