Add directions/navigate button #15

Each address/package/coordinate pair should have a button to open a third-party mapping app, so the user can easily get turn-by-turn directions.

Well this will be easy to add, no intents or anything! https://en.wikipedia.org/wiki/Geo_URI_scheme

Well this will be easy to add, no `intent`s or anything! https://en.wikipedia.org/wiki/Geo_URI_scheme

This will probably be required in config.xml: <access origin="geo:*" launch-external="yes"/>

This will probably be required in `config.xml`: `<access origin="geo:*" launch-external="yes"/>`

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