{No Longer Needed} Minimap Tracker Options

Per Maizou's report on the WoW General forums, relogging might not save the selection properly.

After investigating this, I believe this to have been caused by an early loading of the Addon, interfering with spells being loaded after and rewriting track spell IDs already mapped by the Addon.

The addon is now attached to the very last loading event I could find (minimap zoom out of all things) so the loading should trigger only once, when the splash/loading screen goes away and the minimap gets rendered.

The selection data saving mechanic has been changed which should result in more accurate data preservation across sessions.

Toggling trackable options through the Minimap dropdown now reflects directly into Addon Menu and it gets saved into the Addon variables.