implement fte's sv_fullredirect

[mushis]

this feature is useful mainly for FFA mods, its at FTEsv from r3899
from fte.cfg file:

sv_fullredirect "" //This is the ip:port to redirect players to when the server is full

so when a player tries to join the server, but it is full, he is automatically redirected to another, with a proper message.

good for FFA servers. this way we can reduce the maxplayers of ffa server, making it less chaotic at busy times.

[deurk]

That's a good idea. Would be great to make it possible to add several servers to redirect to, in order of appearance.

[mushis]

i guess 27500 could redirect to 27501
27501 could redirect to 27502
and so on...
this way, only one is needed

[mushis]

if this gets implemented, add a nice informative message to the user.