Rear Dashcam 0.15.3 for Gen5W

Rear dashcam 0.15.3 for Gen5W head units (Android 4.4), as a NEMESIS package: the recorder service and the Dashcam playback app in one install.

Changes in this version:

Camera overlay fixed from boot; no more USB notices

• The camera no longer shows over Android Auto after a boot. In 0.15.2 the fix only took effect after the camera restarted (replugging the drive, reversing). On the first start after boot, the camera's display layer isn't ready yet when recording begins, so the request to hide it was refused and never repeated. It's now retried until it's accepted, usually about 10 seconds after boot. Recording isn't held up by it.
• No more "Reading USB" and "No Supported Files" at the top of the screen when the dashcam drive is plugged in or the head unit starts. The drive is still scanned as before; only the notices are taken down. They may still flash for a split second.

As with 0.15.2, reboot the head unit after installing or updating.

The boot-time overlay retry and the dismissal on replug were checked on the IONIQ 5 (NEEV23). Dismissing the notices at boot is new in this version and hasn't been tried on a car yet.

Install over ADB with nemesis install --update dashcam-0.15.3.zip, or by USB: extract dashcam-0.15.3-usb.zip onto the root of a FAT32/exFAT drive and plug it in. Reboot the head unit after installing or updating to activate the camera overlay fix. Recordings and the recording on/off setting carry over when you update. Check downloads against SHA256SUMS. DashcamPlayer.apk is the app on its own; the package already contains it.

If the reverse camera ever fails to come up, stop and report it, and uninstall the package until it's fixed. Details in the README.