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/send-message.svg

@@ -0,0 +1,5 @@
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+  <rect width="144" height="144" fill="#1a1a1a"/>
+  <path d="M30 72 L114 36 L90 108 L64 88 L74 64 L50 78 Z" fill="#888" stroke="none"/>
+  <line x1="64" y1="88" x2="74" y2="64" stroke="#1a1a1a" stroke-width="4"/>
+</svg>