Implement bracket notation for stacked pins ([1,2,3], [1-4], [1,3,5-7]).
Automatic net naming proceeds based on the smallest logical pin number
in stacked groups.
Provide explode/reform commands in symbol editor for conversion.
Supports arbitrary ranges including BGA alphanum ranges like
[AA1-AA3,CD14-CD22]
Adds some additional QA and trace logging
Fixes https://gitlab.com/kicad/code/kicad/-/issues/2004
Not all rectangles want/need the radius point, but we will only be able
to drag one point at a time. So we re-organize which point of an
overlapping set is selected
Fixes https://gitlab.com/kicad/code/kicad/-/issues/21605
This isn't the best possible UX (having the various modes immediately
available as graphical affordances would be best). But it's somewhat
discoverable, and at least shows the hotkey, if any, and it in the
context menu and not hidden in a toolbar right click menu. So if the
affordance-type system doesn't make it for v10, this will at least
provide something in eeschema.
