Added Alt/Option key binding to lines to extend/pivot from center #1204

Job	Run time
build-python-package / build (ubuntu-latest, 3.11)	6m 2s
build-python-package / build (ubuntu-latest, 3.12)	6m 2s
build-python-package / build (ubuntu-latest, 3.13)	5m 38s
build-python-package / build (macos-latest, 3.11)	4m 7s
build-python-package / build (macos-latest, 3.12)	4m 50s
build-python-package / build (macos-latest, 3.13)	3m 17s
build-python-package / build (windows-latest, 3.11)	6m 17s
build-python-package / build (windows-latest, 3.12)	6m 50s
build-python-package / build (windows-latest, 3.13)	7m 30s
Upload release to PyPI	0s
	50m 33s

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