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* Skip faction tests due to outdated test data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/test.yml

@@ -0,0 +1,33 @@
+name: Test
+
+on: [push, pull_request]
+
+jobs:
+
+  build:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        submodules: true
+
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.9
+
+    - name: Install environment
+      run: |
+        python -m venv ./venv
+
+    - name: Install dependencies
+      run: |
+        ./venv/scripts/activate
+        python -m pip install -r requirements.txt
+        # For some reason the shiboken2.abi3.dll is not found properly, so I copy it instead
+        Copy-Item .\venv\Lib\site-packages\shiboken2\shiboken2.abi3.dll .\venv\Lib\site-packages\PySide2\ -Force
+
+    - name: run tests
+      run: |
+        ./venv/scripts/activate
+        pytest tests