- Remove overlay/static (build-time PRODUCT_PACKAGE_OVERLAYS); its strings
and wallpapers move into pawlet-framework-res-overlay, and the
pawlet-overlays aggregator moves to overlay/Android.bp
- Sign pawlet-framework-res-overlay and pawlet-rpi-framework-res-overlay
with the platform certificate; OMS won't link an android-targeting
overlay whose signer doesn't match framework-res
- Enable the taskbar
- Point docs at PawletPlatform for new resources