refactoring: use thread-safe Subscriptions.create()
Fix #3580, Logging with oc not possible without entering user credentials for gc

- removed no longer sensible check for gc credentials.
Fix #3575, Translation for maintenance options
Fix #3576, german translation for note corrected
fix #3576 also in english strings

Also in english note should be used as a singular. It was mixed between the strings.
Fixes #3572, Context is not an instance of MapActivity

- re-instantiate checking current mapsource against expected mapsource
Add images for contacts addon
remove some nullness warnings in Eclipse
New icons for calendar and contacts addon
New addon icons

New icons for the contacts- and the calendar-addon
(rendered from the svgs by SammysHP)
Add FavPoints parsing for GSAK GPX;
Add test case;
fix #3585: trackable name and type not parsed
Add parsing protection against invalid input
Update tests
Merge branch 'release' into upstream
Merge pull request #3584 from Matrikss/master

#3562 Add FavPoints parsing for GSAK GPX
import personal note from GSAK GPX
read premium only flag from GSAK GPX
#3581: have waypoint name in radar
fix #3577: show keyboard on edit note