Update Trebuchet launcher settings
Control adbd launch with new property debug.adbd

This allows to start adbd while disallowing console access (ro.debuggable=0).
Don't turn off screen and set brightness to maximum

Screen currently can not be turned on again. Result: Display freezes
Also backlight brightness control currently doesn't work, the brightness is always set to maximum.
Cleanup init.sh
Fix external storage support
Enable backlight brightness control