Only send live checks when the connection has been silent for a while.

Also:
* Made the timeout configurable
* Removed the stale randomcharacters config option
* Switched to time_t for time values, even though it doesn't really
matter that much
* Halved the keepAliveTimer frequency

config.ini

@@ -9,9 +9,6 @@ verbosity=1
 [login]
 # must be kept in sync with loginInfo.php
 port=8001
-# enables two randomly generated characters in the
-# character selection menu for convenience
-randomcharacters=true
 # will all custom names be approved instantly?
 acceptallcustomnames=true
 # how often should everything be flushed to the database?
@@ -25,6 +22,9 @@ ip=127.0.0.1
 # distance at which other players and NPCs become visible
 playerdistance=20000
 npcdistance=16000
+# time, in milliseconds, to wait before kicking a non-responsive client
+# default is 1 minute
+timeout=60000
 # little message players see when they enter the game
 motd=Welcome to OpenFusion!
 # NPC json data