Allow a separate log level for the event thread of the terminal server

So you want to debug (timed) events, but don't want to get debug-spew in your
terminal server log output? Now you can: By default, the event thread log
level will be the same as the terminal server, but now you can override this
by setting [BBS] EventLogLevel in the sbbs.ini file or set it in
SCFG->Servers->Terminal Server->Event Log Level.