NFC Polling Mode (3/3)
Signed-off-by: Jubakuba <Jubakuba@gmail.com>
Signed-off-by: sethyx <sethyx@gmail.com>
Reworked transparent layer
When a halo'ed window is opened, the transparent layer will be always visible. It will manage the background dim.
This fixes some apps dimming its sandboxed processes (like chrome).

LayerActivity manages its own lifecycle. When it's focused after paused it finishes itself.

System processes (identified by "android" pkg in SystemUI and system uid in Activity) don't use the layer and still use their own background. This
has been kept this way to not interfere with their activity.
NotificationManagerService: fix typo on led off time variable
Fixing crash in PhoneNumberUtils getNumberFromIntent

Handling intent with no data when trying to retrieve number from
intent.
Update README.md
LayerActivity: Corrected lifecycle
Should contemplate the case that the activity gets stopped