Plater Nameplates

@Terciob:
- Additions and fixes for the Designer.

@cont1nuity:
- Fixed some issues with blizzard font override and hiding healthbars not working in classic.
- Adding base support for the new aura API in Midnight (12.1) and general adjustments for 12.1
- Adding 'select area scaling' options to adjust clickable area size for friendly and enemy units.
- Removing IMPORTANT aura filter for Midnight, as it has been removed from the game.
- Fixing some issues with restoring CVars correctly.
- Fixing some issues for MoP.
- Fixing an error around renaming functionality.
- Fixing execute for rogue on retail.