Background Job Rework (#193)

...p/src/main/java/de/rki/coronawarnapp/storage/LocalData.kt

...n/java/de/rki/coronawarnapp/storage/SettingsRepository.kt

...rc/main/java/de/rki/coronawarnapp/ui/main/MainActivity.kt

...rc/main/java/de/rki/coronawarnapp/ui/main/MainFragment.kt

...e/rki/coronawarnapp/ui/riskdetails/RiskDetailsFragment.kt

...java/de/rki/coronawarnapp/ui/settings/SettingsFragment.kt

.../rki/coronawarnapp/ui/settings/SettingsTracingFragment.kt

...va/de/rki/coronawarnapp/ui/viewmodel/SettingsViewModel.kt

...main/java/de/rki/coronawarnapp/util/ConnectivityHelper.kt

...e/rki/coronawarnapp/util/formatter/FormatterRiskHelper.kt

...n/java/de/rki/coronawarnapp/worker/BackgroundConstants.kt

...va/de/rki/coronawarnapp/worker/BackgroundWorkScheduler.kt

...oronawarnapp/worker/DiagnosisKeyRetrievalOneTimeWorker.kt

...ronawarnapp/worker/DiagnosisKeyRetrievalPeriodicWorker.kt

Corona-Warn-App/src/main/res/layout/include_risk_card.xml

Corona-Warn-App/src/main/res/values/strings.xml