classicons: DARK_FORCE has not been used since MoP beta or early MoP
classicons: Refactor code

- Tables are unnecessary for just one spell
- ClassPowerEnable|Disable is the same for every class
- Move the talent/spell change events to the element's enable/disable functions
classicons: Make sure the player is in a spec or has a spell that matches the element
classicons: Prevent ToggleVehicle from enabling the element regardless of the player spec on load