Change unban submission format

Sends JSON 'unbandata' instead of the ID, with the ID to unban and the
ID of the admin that unbanned.
Ooops

Might help to send the ID that's banned.
Allow for ban/user retrieval using POST

and sending extra keys.
Override built in randomise ready room vote

so it doesn't move AFK players.
Multi-group inheritance

One level only, no recursive inheritance.
Disconnect message team colours
Recursive inheritance
Fixed UTF-8 strings in the chatbox

Also fixed the mapvote plugin not always indicating when it is changing
map.
Merge pull request #291 from Person8880/develop

Web improvements and small fixes