Set default character

[Zamujasa]

Thoughts:

- move the various game options like music volume, controls, etc. out of the character menu and into a more general "game preferences" list.
- character setup would be moved under the game prefs as an additional option to create new profiles

- keep UI style and other similar things per-profile
- have an option in the game prefs list that allows you to select a default profile, or select "none" as a default

- joining works like it does now, loading whatever the current profile is - you can still load a different one from game prefs
- if you don't have a default set, new window pops up letting you choose from your saved profiles
- antag token button available if you have more than 0, works like a toggle pre-round and doesn't show up for late-joining