What's changed?

• UDP receiver based on asyncio-dgram and pynmea2
• Add data model classes and core display rendering routines
• Add display subsystem, using one of PNG, pyglet, PySDL2, eips
• Render all missing fields (AWA, TWA) and add corresponding assets
• Packaging: Include assets into Python package

Full Changelog: https://github.com/maritime-labs/boatface/commits/0.0.0