(iOS) Show or hide the toolbar solely based on whether the top view controller has tool bar items;
     Remove the push/popViewController overrides from RetroArch_iOS.
(iOS) Change pause menu into a full screen menu for now.
(iOS) Fix some lingering core setting issues
(iOS) Fixups:
	Don't update global core selection when choosing a core from a list of multiple auto-detected ones.
	For setting text inputs use the current value as a placeholder string.
	Make the state select UISegmentedControl less ugly on iOS6.