Allow sending broadcast intents to other apps via notification

[dshokouhi]

Fixes: #1020

We must set message: command_broadcast_intent and the title must contain the Action and channel must contain the Package name.

Format:

message: command_broadcast_intent
title: ACTION
data:
  channel: PACKAGE_NAME

Tested with sleep as android API: https://docs.sleep.urbandroid.org/devs/intent_api.html#action-intents-to-control-sleep

Example:

message: command_broadcast_intent
title: com.urbandroid.sleep.alarmclock.STOP_SLEEP_TRACK
data:
  channel: com.urbandroid.sleep

If title or channel is not provided we post the notification to the device as normal, otherwise if there is another failure we show a toast.

Docs: home-assistant/companion.home-assistant#376
FCM: pending

[JBassett]

Rather than overloading title to have both package and action lets break it up into 2 fields.