This will always show 1 unit from each system, with the primary unit
being the current frame unit and the secondary unit being the
most recent unit used from the other system. These are saved in
the settings, so they are saved between runs.
This commit applies display origin transforms to all Pcbnew
dialog classes that use UNIT_BINDER for their formatting:
* DIALOG_CREATE_ARRAY
* DIALOG_FOOTPRINT_BOARD_EDITOR
* DIALOG_GRAPHIC_ITEM_PROPERTIES
* DIALOG_GRID_SETTINGS
* DIALOG_MOVE_EXACT
* DIALOG_PAD_PROPERTIES
* DIALOG_POSITION_RELATIVE
* DIALOG_TEXT_PROPERTIES
* DIALOG_TRACK_VIA_PROPERTIES