This is mainly for simulation testing where the dialog has to be
grown every time you restart the app, but it might as well be applied
to the similar dialogs.
Fixes https://gitlab.com/kicad/code/kicad/issues/12887
1) Copy label fields when converting.
2) Don't assume netclass directive should be net name -- this is very
unlikely.
3) Don't show font controls in Netclass Directive Properties dialog --
there's no basic text associated witha Directive Label.
This is mostly to output the aliases sorted (for ease of VCS integration),
but also because a btree will be faster than hashing on a small dataset.
Fixes https://gitlab.com/kicad/code/kicad/issues/11890
It hasn't worked since we rejiggered the default grid selection mode
anyway, and for some reason it eats <esc> key events after the dialog
has been resized.
Fixes https://gitlab.com/kicad/code/kicad/issues/11015
Also fixes some plot bugs with arcs.
Also moves polygonization of arcs (when required) in plotting code
from 5 degrees to calculated based on ARC_HIGH_DEF.
Fixes https://gitlab.com/kicad/code/kicad/issues/5017
Mike Williams
Jeff Young
Miklos Marton