Use TACAN channels more selectively, use pytest (#1554)

* Use TACAN channels more selectively

* Increase tacan range to 126

* Use pytest and add workflow

* Skip faction tests due to outdated test data

* Run mypy on tests directory also

* Use iterators for bands AND usages, add tests

.github/workflows/build.yml

@@ -36,6 +36,11 @@ jobs:
       run: |
         ./venv/scripts/activate
         mypy gen
+
+    - name: mypy tests
+      run: |
+        ./venv/scripts/activate
+        mypy tests
       
     - name: update build number
       run: |