Add ability to open contact coordinates in a different app

[otwacam]

Changes the "Navigate" button to "Open in another app" and update functionality to allow the coordinates to be opened in other map-based apps instead of just Google Maps.
Sharing coordinates with another app uses the geo URI scheme which is supported by most apps. The zoom level query parameter is used but is not supported by all apps.

[otwacam]

For potential further discussion I had considered replacing the "Navigate" button with this new functionality but was reluctant to replace the existing functionality before discussion.
The existing Navigate button currently only works with Google Maps and allows a single click to open the app and start navigation. This is not functionality exposed by every app and would potentially require changes for each one even if they do support that.
If this was to be replaced it would mean it would require being in the target app and then pressing navigate from there but it would be a single button that is app-agnostic. As you can see from the screenshots above Google Maps opened the location with the Directions button ready to be selected.
Interested if there would be any desire to change this.

[growse]

Very much like the idea of this being more app-agnostic. I'm not a huge fan of multi-fab buttons though, as I think it's a little confused.

The "share" button currently shares the current location in text format, I wonder if the right answer is to update the navigation button with more specific sharing to location-based apps (e.g. Osmand, gmaps etc.)? Feels more useful that hard-coding the gmaps navigate intent.

[otwacam]

The app-agnostic approach is also my preference.

I do think that the answer is to change the Navigation button to something like "Open in another app" with this new functionality for the location-based apps. From looking at other apps there seem to be a mixture of those who use the share button to open a sub-menu with different ways to share or having it just share the text as the Owntracks app already does. Seeing as we already have a Navigate button it does feel best to change what already exists.

I'll remove the share button change and update the Navigation button.

[otwacam]

Finalised the discussed changes. Should be good for another review.