refactor version info so pyinstaller will work; add build mac and ubuntu standalone executables

.github/workflows/build_mac.yml

@@ -0,0 +1,26 @@
+name: Build and publish mac standalone executable
+
+on: workflow_dispatch
+
+jobs:
+  build-and-publish:
+    runs-on: macos-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+
+      - name: Build
+        run: |
+          pip install pyinstaller
+          pip install -r requirements.txt
+          pyinstaller -F -n meshtastic meshtastic/__main__.py
+      - uses: actions/upload-artifact@v2
+        with:
+          name: meshtastic
+          path: dist

.github/workflows/build_ubuntu.yml

@@ -0,0 +1,26 @@
+name: Build and publish ubuntu standalone executable
+
+on: workflow_dispatch
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+
+      - name: Build
+        run: |
+          pip install pyinstaller
+          pip install -r requirements.txt
+          pyinstaller -F -n meshtastic meshtastic/__main__.py
+      - uses: actions/upload-artifact@v2
+        with:
+          name: meshtastic
+          path: dist

.github/workflows/build_windows.yml

@@ -15,7 +15,7 @@ jobs:
         with:
           python-version: 3.9
 
-      - name: Build exe
+      - name: Build
         run: |
           pip install pyinstaller
           pip install -r requirements.txt