Small patch / bug fixes

-Respawn added during tutorial so you don't have to restart the entire tutorial if you die
-Big fixed with leaving to MainMenu from tutorial
-Added an indicator on the MainMenu to show you when you have new spells/abilities to unlock
-Steam Invites occasionally failed, I believe this is fixed now!
-Multiplayer restart still wasn't working as expect, should be good now
-When you startover, your old learned spells are now cleared