fix/refactor: use generic ModuleStatus class for getting status of optional modules (#1427)

* fix/refactor: use generic ModuleStatus class for getting status of optional modules

* fix: add and order macOS bin locations by PATH precedence

* ui: add title for optional modules section in the about window

* fix: revert errant license change

* fix: return which(cmd) instead of the original cmd

* refactor: implement review feedback

* feat(ui): add tooltips for module locations on about screen

tests/qt/test_about_modal.py

@@ -11,7 +11,7 @@ def test_github_api_unavailable(qtbot: QtBot, mocker) -> None:
     mocker.patch(
         "requests.get",
         side_effect=ConnectionError(
-            "Failed to resolve 'api.github.com' ([Errno -3] Temporary failure in name resolution)"
+            "Emulating a failure with 'api.github.com' ([Errno 0] This should be handled)"
         ),
     )
     modal = AboutModal("/tmp")