Also simplifies the dialog by removing the user grid (now that you
can add as many user grids as you want).
This does mean that you can no longer have an asymmetric grid, but
it gets too complex if we allow everything for everyone.
Add a reset button that will only show up if the user
edits the JSON configuration for grids. This is a temporary
measure until we have a real grid editor GUI in V7.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/7595
They're now used for bus definition control characters.
Also fixes the sheet pin edit dialog to correctly escape/unescape
netnames.
Fixes: lp:1840834
* https://bugs.launchpad.net/kicad/+bug/1840834
Currently, if a old label already containing a '/' (or a space) is edited, it is accepted,
but no new not allowed char can be added to the label.
(Previously, a sheet pin label was not filtered)
File "rules" has instructional text as comments near top.
2) Convert all text files in repo to LF line ending form.
Any checkout done with "rules" in play will convert the working
tree to native line ending, while keeping repo as LF line ending.