Priority Announcement Changes

-Centcom announcement proc merged with generic priority announcement proc
-Re-added Captain Announces accompanied by a new pleasant sound, instead of the generic priority announcement
-Captain Announcements and RC announcements will automatically generate a newscaster article
-The AI may now make priority announcements via communications console that emulates the automated messages
-Priority announcements without any defined accompanying sound will play a generic "Attention" soundbyte as an audio cue
-Communications consoles will display who is currently logged in