When aligning in pcbnew, check for pad/module locks before performing a
move and query the user.
When aligning on pads, don't move the pad without moving the footprint,
so we don't break footprints.
Fixes: lp:1751352
* https://bugs.launchpad.net/kicad/+bug/1751352
reimplement the centerpoint distribution and use it when the items to be
distributed overlap leaving no gap to use for spacing
Fixes: lp:1748763
* https://bugs.launchpad.net/kicad/+bug/1748763
Using footprint rects instead of the larger bounding box means that
reference and value texts no longer influence the positioning of the
footprint in unexpected ways. Treatment of non-module items is
unchanged.
- added TOOL_INTERACTIVE::resetTransitions()
- made protected and moved TOOL_BASE::setTransitions() to TOOL_INTERACTIVE
- TOOL_MANAGER calls TOOL_INTERACTIVE::resetTransitions() instead of
setTransitions()