Initial commit: Paperwall, a standalone e-ink dashboard

Navidrome now-playing, clock, and weather for a Waveshare epd4in0e panel,
with a local web UI and install/uninstall scripts for the Pi.

screens/__init__.py

@@ -0,0 +1,13 @@
+from screens.clock import ClockScreen
+from screens.navidrome import NavidromeScreen
+from screens.weather import WeatherScreen
+
+SCREEN_CLASSES = {
+    ClockScreen.id: ClockScreen,
+    WeatherScreen.id: WeatherScreen,
+    NavidromeScreen.id: NavidromeScreen,
+}
+
+
+def create_screens() -> dict:
+    return {screen_id: cls() for screen_id, cls in SCREEN_CLASSES.items()}