Various touchups & fixes

Removed unused imports
Added an alias to flatfile in /mmoupdate
Removed vestiges of /mmoupdate confirm system
Commented PURGE_TIME
Add getSkillMapFromLine for powerless purge & flatfile leaderboards
Add tryClose() for non-repetition glory
Synchronize access to the flatfile database, to avoid data loss
Fix SQL Database loadPlayerProfile(name, true) behavior
Add @SuppressWarnings to PlayerUpdateInventoryTask