Timeout aesthetics
BeeBS now has a functioning 3 min inactivity timer...so you'd better read those messages quickly!

The solution was to use INKEY and a tiny bit of logic. If a key is pressed the numerical value of that key
is stored in the variable A%, if no key is pressed within 180 seconds (3 min or 180 000 hundredths of a second)
then instead of reporting back the value of A% to the previous function the disconnect procedure is called
(PROCDC).
I wasn't a fan of the message editor in OBBS, so I've updated its aesthetics slightly. For now this improvement only
appears for users in a Mode 7 terminal.

Still to do:
1. Freezing on cursor key presses
2. Chat with SysOp freezing