Further notification improvements

app/build.gradle.kts

app/sampledata/libraries.json

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

...uschku/quasseldroid/service/QuasselNotificationBackend.kt

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

.../de/kuschku/quasseldroid/settings/NotificationSettings.kt

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

...hku/quasseldroid/ui/clientsettings/about/AboutFragment.kt

...chku/quasseldroid/util/QuasseldroidNotificationManager.kt

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

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

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

build.gradle.kts

lib/build.gradle.kts

malheur/build.gradle.kts

persistence/build.gradle.kts

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

viewmodel/build.gradle.kts