Added a new tab for subscribing to and showing CarProperties
within Android Auto.
The UI handling is a bit sluggish still, but can potentially be
imporved further.
Refactored the AA logic so it is more easy to be extended
in future. Also changed from a standard Grid to a Tabbed grid
and prepared a UI for the Vehicle Information values
That will be added in the next commit.
Now the requested frequency and the priority of location updates can be
selected in a newly integrated SettingsActivity which can be extended
for future use.
Added some base GoogleMap widget logic and a way to listen to ones own
location updates. In future this needs to be extended with a way to
listen to the updates of other users.
