Shefki:
	- Disable vehicle swaps when they shouldn't happen, since the game has specified not to.
	Note: This is a complete fix the secure code has a bug and click on the
	unit will still target the wrong unit.  Bug has been reported to
	Blizzard.  Generally this shouldn't be a playability issue since click
	on the player frame shouldn't be necessary during these events/quests.
	- Fix issue where you only see the top of the Portrait in 3D mode.
	Looks like the model frame no longer sets the position back to the
	default when changing models.
	- Cleanup some unnecessary global variables.
	PitBull4 should not be setting any global variable other than the
	PitBull4 table, the SLASH_PITBULLFOUR* global variables and
	UI_DROPDOWNMENU_MENU_LEVEL as necessary for interfacing with Blizzard's
	API.
