Fixes #208

...ain/java/de/kuschku/quasseldroid/dagger/SettingsModule.kt

...main/java/de/kuschku/quasseldroid/service/AsyncBackend.kt

...in/java/de/kuschku/quasseldroid/service/QuasselService.kt

...a/de/kuschku/quasseldroid/settings/RedirectionSettings.kt

...rc/main/java/de/kuschku/quasseldroid/settings/Settings.kt

...chku/quasseldroid/ui/chat/messages/MessageListFragment.kt

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

app/src/main/res/xml/preferences.xml

...est/java/de/kuschku/quasseldroid/util/AvatarHelperTest.kt

...ava/de/kuschku/quasseldroid/persistence/dao/MessageDao.kt

...de/kuschku/quasseldroid/persistence/db/QuasselDatabase.kt

...de/kuschku/quasseldroid/persistence/models/MessageData.kt

...ku/quasseldroid/persistence/util/QuasselBacklogStorage.kt

viewmodel/src/main/java/de/kuschku/quasseldroid/Backend.kt