Added a few more stats to keep track of:
- Max users in chat
- Stream start
Also added a `/stats` command to list the user count (current and max),
as well as uptime (sever and stream, separately).
Resolves#85
Stream statistics will now print when enabled in settings.json. There is messages in, messages out,
and total time running. The main function was changed so the server setups for the main and rtmp
are in separate functions, and both are started with their own goroutine. OS Interrupt catching was added,
and if stream stats is true, the stats will be printed.
