* Replaced SuperWoW GUID with native Turtle WoW GUID in focus system
* Added memoization API for `/pfcast` and `/castfocus` performance boost
* Moved Druid mana bar from superwow.lua to nampower.lua
* Cleaned up superwow.lua - removed duplicate/migrated code
* Updated GUI: "Druid Settings" replaces "SuperWoW Settings" header
* Focus system now standalone - no SuperWoW dependency required
With this change, the SpellTargetUnit() function is preferred
over the TargetUnit(). However this only works if a non-friendly
target is currently selected and the mouseover is a friendly one.
If a self cast is detected, the SpellTargetUnit() function will
be used to avoid a target change. Auto-attacks now continue on
self casts because the target has no longer to be changed.
Meow