Announcement rework:
Moved announcement broadcast to Broadcast#toAllOnlinePlayers
Unified all announcements into single engine instead of 2 different
Moved storage holder of announcements into the database in one table
instead of database table and pure txt file
Redesigned UI of admin panel
Added editing ability of announcements
Added restarting ability of automatic tasks one per one or all at once
Added ability of broadcasting message at center of the screen of all
players
Merge remote-tracking branch 'origin/master' into ertheia