Keep Through Hole pads on external layers should be ON by default, because
such a pad does not allow soldering/unsoldering, if this option this option is OFF
Also rename dialog_enum_pads.fbp as dialog_enum_pads_base.fbp, as usual
Improve dialog layout and fix UI policy issues with all of the dialog
boxes in the Gerbview and Pcbnew code paths.
Updated the use of component to footprint where appropriate.