Updates the git connection dialog to reflect default agentic behavior,
followed by default keys and only then reverting to a custom selection
if the user desires
Fixes https://gitlab.com/kicad/code/kicad/-/issues/20204
- Utilize scoped deletion for individual git_*_free() calls
- Protect against multiple usage when updating icons
- Reduce frequency of git update calls
Use enable/disable instead of show/hide to prevent large areas of blank
space in the dialog.
Set the minimum dialog size after the initial launch to prevent controls
from being cut off when resizing dialog to less than the initial size.
Fix static and dialog title bar string capitalization.
Add colons (:) to the end of description static text controls as is done
elsewhere in KiCad.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/20045
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
