Add cross-platform support to decky (#387)

* Import generic watchdog observer over platform specific import

* Use os.path rather than genericpath

* Split off socket management in plugin.py

* Don't specify multiprocessing start type

Default on linux is already fork

* Move all platform-specific functions to seperate files

TODO: make plugin.py platform agnostic

* fix import

* add backwards compat to helpers.py

* add backwards compatibility to helpers.py harder

* Testing autobuild for win

* Testing autobuild for win, try 2

* Testing autobuild for win, try 3

* Testing autobuild for win, try 4

* Create the plugins folder before attempting to use it

* Implement win get_username()

* Create win install script

* Fix branch guess from version

* Create .loader.version in install script

* Add .cmd shim to facilitate auto-restarts

* Properly fix branch guess from version

* Fix updater on windows

* Try 2 of fixing updates for windows

* Test

* pain

* Update install script

* Powershell doesn't believe in utf8

* Powershell good

* add ON_LINUX variable to localplatform

* Fix more merge issues

* test

* Move custom imports to main.py

* Move custom imports to after __main__ check 

Due to windows' default behaviour being spawn, it will spawn a new process and thus import into sys.path multiple times

* Log errors in get_system_pythonpaths() and get_loader_version() + 

split get_system_pythonpaths() on newline

* Remove whitespace in result of get_system_pythonpaths()

* use python3 on linux and python on windows in get_system_pythonpaths()

* Remove fork-specific urls

* Fix MIME types not working on Windows

.github/workflows/build.yml

@@ -84,6 +84,49 @@ jobs:
       with:
         path: ./dist/PluginLoader
 
+  build-win:
+    name: Build PluginLoader for Win
+    runs-on: windows-2022
+
+    steps:
+    - name: Checkout 🧰
+      uses: actions/checkout@v3
+
+    - name: Set up NodeJS 18 💎
+      uses: actions/setup-node@v3
+      with:
+        node-version: 18
+      
+    - name: Set up Python 3.10.2 🐍
+      uses: actions/setup-python@v4
+      with:
+        python-version: "3.10.2"
+        
+    - name: Install Python dependencies ⬇️
+      run: |
+        python -m pip install --upgrade pip
+        pip install pyinstaller==5.5
+        pip install -r requirements.txt
+
+    - name: Install JS dependencies ⬇️
+      working-directory: ./frontend
+      run: |
+        npm i -g pnpm
+        pnpm i --frozen-lockfile
+
+    - name: Build JS Frontend 🛠️
+      working-directory: ./frontend
+      run: pnpm run build
+
+    - name: Build Python Backend 🛠️
+      run: pyinstaller --noconfirm --onefile --name "PluginLoader" --add-data "./backend/static;/static" --add-data "./backend/legacy;/legacy" --add-data "./plugin;/plugin" ./backend/main.py
+        
+    - name: Upload package artifact ⬆️
+      uses: actions/upload-artifact@v3
+      with:
+        name: PluginLoader Win
+        path: ./dist/PluginLoader.exe
+
   release:
     name: Release stable version of the package
     if: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.release == 'release' }}