Add new command "/notify status" to enable/disable status messages,
such as users going on/offline or room joining/parting.
Add 's' to make the preference file read
Add new command /statuses for status notifications
Add function prototype and make the default for the /statuses command be ON
Add support for autocomplete of /statuses command
Merge remote-tracking branch 'backalor/master'

Conflicts:
	src/command.c
	src/preferences.c
	src/preferences.h
	src/windows.c