- Save a note of the username, not just the reason.
- Allow setting a mask with the `banip` command.
- Make ban.txt's formatting a lot more sane. Username and reason are stored in quotes. The mask uses the same formatting as actual CDIR.
- Keep track of if we tried to load ban.txt. If it wasn't, then don't save over it with a blank file.
- Disallow quotes in player names, as it makes player name detection in console more annoying, and saving username in files scary.

# Conflicts:
#	src/d_clisrv.c
#	src/d_netcmd.c
#	src/i_tcp.c

(cherry picked from commit f584b61c93a97e1a9852f306acba673ced21e03a)

Each server in the server list requires a node. It's also MAXNETNODES-1 because
the first node is yourself.

Now in a mergable state

I don't know how many of the changes in d_clisrv were really necessary,
I was just franticly trying to figure out the source of the local sync
fail

The importants:
- Fixed compiling
- Combined G_BuildTiccmd for all players, no more need for a function
for each
- You can actually start 3p/4p mode

Possibly fix some whitespace problems

-Added a timeout for game state downloading to prevent definitive join freezes in some cases. The timeout has a minimum value of "jointimeout" and gets higher as the game state grows in size
-If the server tries to kick a joiner who is downloading the game state, they will get a timeout instead, because a regular kick would only happen once the game state has been downloaded
-Added a timeout for player ticcmd packets, again to prevent freezes to happen in some cases
-File/game state downloading is now faster, the speed is controlled by the "downloadspeed" cvar, in packets per tic
-The reason is now properly shown when the server refuses connection
-Changed the default values of "nettimeout" to 10 seconds (previously 15) and "maxsend" to 4 MB (previously 1)
-Added a "noticedownload" cvar that displays a message in the server console when someone is downloading a file

(no actual SLOC changes)