Add Paarrot Stream Deck Plugin with core functionality

- Implemented main plugin structure including manifest, HTML, and JavaScript files.
- Added actions for toggling mute, toggling deafen, changing channels, sending messages, and getting status.
- Created property inspector for changing channels and sending messages.
- Developed SVG icons for actions and status display.
- Established WebSocket connection for communication with the Stream Deck.
- Implemented API calls to interact with the Paarrot voice chat application.
- Added validation script to ensure proper plugin structure and manifest compliance.
- Included test Electron application for window creation and loading content.

streamdeck-plugin/com.paarrot.streamdeck.sdPlugin/images/mute-off.svg

@@ -0,0 +1,5 @@
+<svg width="144" height="144" viewBox="0 0 144 144" xmlns="http://www.w3.org/2000/svg">
+  <rect width="144" height="144" fill="#1a1a1a"/>
+  <path d="M72 36 L90 54 L90 90 C90 100 82 108 72 108 C62 108 54 100 54 90 L54 54 Z" fill="#888" stroke="none"/>
+  <ellipse cx="72" cy="54" rx="18" ry="24" fill="#888"/>
+</svg>