The event_lputs() callback now takes a callback data (cbdata) pointer, which

may be different than the cbdata pointer for the other bbs_startup_t callbacks.
NT services now include the log level in log messages (allowing SBBSCTRL
to filter/colorize as appropriate).
Now use asynchronous logging (to linked lists) which improves performance
considerably (BBS/server threads are not waiting for GUI updates) and allows
the log to be completely paused (no updates) without losing any log messages.
NT services and integrated servers should have the same log functionality now
(log files, filtering, colorization).