ADDED new rectangle graphics tool for PCBNew and Footprint Editor.
Also adds rectangle tool to both Footprint Editor and PCBNew Place
menus.
The Aux Origin tool can come back once we have multi-select toobar
buttons.
Also collapses an unnecessary level out of the auxOrigin and gridOrigin
settings.
Fixes https://gitlab.com/kicad/code/kicad/issues/2246