CHANGED: The reset buttons now set the X or Y offset to the current
offset from the reference position. Selecting individual pads as the reference item is now also possible.
Use standard Magnetize() to handle grid and magnetic pads.
Use the standard menu from PCB_TOOL. Delegating the menu to
the SELECTION_TOOL just caused grief.
Also brings clients (such as Position Relative To) into line,
and implements better Cancel behaviour.
Also improves visibility of modal status messages:
- moves Select Anchor message from status bar to popup
- moves Select Reference message from dialog to popup
Fixes: lp:1786727
* https://bugs.launchpad.net/kicad/+bug/1786727
- added TOOL_INTERACTIVE::resetTransitions()
- made protected and moved TOOL_BASE::setTransitions() to TOOL_INTERACTIVE
- TOOL_MANAGER calls TOOL_INTERACTIVE::resetTransitions() instead of
setTransitions()