Firetv volume control

In POC(Proof of concept) state - using it in my current fire tv lite, feel free to try it out

This is a second draft, first draft was without UI

Usage:

Install apk and then grant below permissions from adb

1. To be able to listen to key presses on remote
2. To be able to show the volume controls UI

adb shell settings put secure enabled_accessibility_services com.example.volumecontrolservice/com.example.volumecontrolservice.AccessibilityService
adb shell appops set com.example.volumecontrolservice  SYSTEM_ALERT_WINDOW allow