Merge branch 'single-connection' into 'master'

app/src/main/java/de/ccc/events/badge/card10/Constants.kt

...va/de/ccc/events/badge/card10/common/ConnectionService.kt

...events/badge/card10/filetransfer/BatchTransferFragment.kt

.../events/badge/card10/filetransfer/FileTransferFragment.kt

.../ccc/events/badge/card10/filetransfer/LowEffortService.kt

...main/java/de/ccc/events/badge/card10/main/MainFragment.kt

...main/java/de/ccc/events/badge/card10/mood/MoodFragment.kt

...a/de/ccc/events/badge/card10/sparkle/BeautifulFragment.kt

...ain/java/de/ccc/events/badge/card10/time/Card10Service.kt

app/src/main/res/layout/main_fragment.xml

app/src/main/res/values/strings.xml