Merge pull request #3965 from marco-dev/fixStaticMapsCropLayout

fixes #3959 - don't crop static maps due to Google license
Update changelog_release.xml
Upgrade RxJava to version 0.19
fix #3973: RxJava periodic timer is not stopped in onPause
Added source jars for rxJava 0.19.0

- it might be necessary to close and reopen the project to make them used
crowdin: New translations
Merge pull request #3974 from rsudev/crowdin_translations

crowdin: New translations
fix #3970: crash when trying to change GC-username
Fix bulding with gradle/Android studio.

Update rx java to 0.19
Also add unfinished prototypes for the seldom used side projects.
Merge pull request #3975 from schwabe/gradle_plugin_011

Fix bulding with gradle/Android studio.
fix #3981: mystery cache types renamed on website
Merge remote-tracking branch 'origin/release'
crowdin: New translations
Merge pull request #3982 from rsudev/crowdin_translations

crowdin: New translations
Fixes #3939, Will attend not counted in log summary on OC-logbooks
fix #3980: remove "set destination" menu in compass
reorder compass menu items
fix #3927: do not sort stage, puzzle and waypoint
refactoring: more assertj instead of junit assert
fix #3855: remove overflow menu option