Add config GUI and allow every bar to be controlled
Explicitly check if each bar has an aura before...

... updating its shown state
- Correctly pass DB to ns.InitOptions
Add custom SpellEditBox widget for auras

-- Known issue: EditBoxes may get stuck on MEDIUM strata when the
options frame is on HIGH. To solve this, select another bar option and
then select the original bar option
- Update shown states when user changes a setting in the GUI
- Allow the user to shift-click spell links into the aura inputs
-- Spell links are replaced with spell names when the Okay button is
clicked
- Add missing type field for invert options
- Make slash command call InterfaceOptionsFrame_OpenToCategory twice on
first use so the category is opened properly
- Update TOC Notes field to reflect new functionality