Add parties that mostly work but dont do anything

Fix bugs with basic parties

Add in draft of party alloc functionality

Fix glitch where it used MAX_PARTY_SIZE instead of ctf_teams.MAX_PARTY_SIZE

Make it work with any party allocator. Also fix some bugs with invites etc.

Use a modified player allocator for the parties

Make code pass luacheck. Fix a small bug. Make some of the unchanging party messages be in a table instead of hardcoded

Notify inviter and not just the invited when the invited was unable to join a party cause it was already too big

If a valid invite is sent out but in the mean time the number of players in the sender's party grows, and then the invited tries to accept but is rejected cause the inviter's party is too big, the invite will be deleted.

Revert changes that I accedentally made

Add back in a newline at end of file that I deleted, in a random file. So that it is identical to upstream.

Make parties.lua fit formatting better with a newline at the end