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
f66cbaf43a