This behavior provided shorter net names, but was confusing if
the user gives an explicit strong driver in the subsheet but not
one in the parent sheet.
Testcases updated for net name changes; connectivity is the same
Fixes https://gitlab.com/kicad/code/kicad/-/issues/4201
Removed the bitmap status field that saved internal states into the
file, creating rcs churn. Also removed the unneeded count variables at
the start of the file as these created merge conflicts for every board
that had multiple revisions
Fixes https://gitlab.com/kicad/code/kicad/issues/1850
Jon Evans
Seth Hillbrand