Sometimes, you don't want those 45° corners in your nice, clean zones.
This adds an additional mode that can be selected, cycling through
free-angle, 45° angle and 90° angle constraints
Recommendation is to avoid using the year nomenclature as this
information is already encoded in the git repo. Avoids needing to
repeatly update.
Also updates AUTHORS.txt from current repo with contributor names
This assigns the "Tab" key to a general pcbnew 45° limitation. Limit
can be enabled/disabled using context menu as well.
Removed the user preference for 45° limitation on graphic lines as that
is overlapping with the general limitation, which is not an editing
preference so much as a temporary adjustment to tool action.
Related to https://gitlab.com/kicad/code/kicad/-/issues/8490
