Technically, any endpoint is equivalent for the
geometry that you get out. But "endpoint" sounds like
it means the point that is not the start point.
So change the tool to explicitly take the start and
midpoint as inputs.
Fixes: https://gitlab.com/kicad/code/kicad/-/issues/19221
Provides options for editing the shapes though entry of
different modes, such as "centre/start/angle" for arcs.
Several new modes are implemented.
Relates-To: https://gitlab.com/kicad/code/kicad/-/issues/13356
(Copper shapes, on the other hand, can. Since we use
GetItemDescription() to report DRC errors and the like,
it's better to have it report the net even when it's
<no net>.)
Placing a limit on the number of values that a field is allowed to hold
makes it blank when we set more than this number. There's not a good
reason to limit the number of digits we allow at the field level (we
round to 4 decimal points in the backend)
Fixes https://gitlab.com/kicad/code/kicad/-/issues/17473
