Reimplement max_idle without a separate thread

Remove the KillIdle thread.  Add timeout to struct iop, initialized in
io_open().  Obey it in io_input() by passing it to empth_select().  If
empth_select() times out, report that back through io_input() to
recvclient() and player_login().  If player_login() receives a timeout
indication, print a message and terminate the session.  If
recvclient() receives a timeout indication, flash a message to the
player and initiate a shut down the player's session.

Create WIN32 sys/time.h to define struct timeval.  This creates some
conflicts with WIN32 windows.h definitions.  Including windows.h in
show.c and info.c creates conflicts, so remove that.  Modify service.c
to include sys/socket.h instead of windows.h to remove the conflict
with sys/time.h.

src/server/main.c

@@ -382,7 +382,6 @@ start_server(int flags)
 	exit(1);
 
     empth_create(player_accept, 50 * 1024, flags, "AcceptPlayers", 0);
-    empth_create(player_kill_idle, 50 * 1024, flags, "KillIdle", 0);
 
     market_init();
     update_init();