Add GitHub workflow script to build Python wheels. Update PyPI package

.github/workflows/wheels.yml

@@ -0,0 +1,31 @@
+name: Build New Wheels
+on: [workflow_dispatch]
+jobs:
+  build_wheels:
+    name: Build wheels on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macOS-latest]
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+
+      - uses: actions/setup-python@v2
+
+      - name: Install cibuildwheel
+        run: python -m pip install cibuildwheel==1.10.0
+
+      - name: Build wheels
+        env:
+          CIBW_ARCHS: auto
+          CIBW_BUILD: cp35-* cp36-* cp37-* cp38-* cp39-*
+          CIBW_BEFORE_BUILD: ln -s $(pwd) pkg/pypi/native; cp -f src/bindings/python/*.py pkg/pypi/libzt/; cd pkg/pypi; python setup.py build_clib
+        run: |
+          python -m cibuildwheel pkg/pypi --output-dir wheelhouse
+
+      - uses: actions/upload-artifact@v2
+        with:
+          path: wheelhouse/*.whl