Vaults will unload after 5 seconds of last person exiting them

Fixes #19
Note: This requires testing to be sure the issue is fixed.
Extra protection against voiding
Few map fixes and changes
You can no longer gain points in house wars during round setup

Fixes #22
Evanesco will no longer work against flying players

Fixes #24
Text output of spells/items can now be seen by invisible people

Fixes #36
Freeze Area now unfreezes if already GM frozen

Fixes #30
Deatheater PMing someone who has full inbox will no longer reveal them

Fixes #38
Minor change to the PM fix
Imperio will not work anymore if your target is also using Imperio
Tiny fix to undropable items
Changed more text output so invisible players hear it
Area fixes
Merge pull request #47 from Rotem12/master