Mattias Eriksson 9148b7da5f Initial Android Auto support
This adds android auto support accordign to
https://developer.android.com/training/auto/messaging/index.html#messaging
However, since android auto is not officially supported in my country,
the functionality is limited. Which means that I have not been able
to fully test everything yet.

What work is:
* Message notification is shown.
* When you click on it, the message is read.

Closes #5880
2016-11-27 19:33:11 -08:00
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