Revert "Interoperability to 1.5.X (#1173)"

.idea/codeStyles/Project.xml

Corona-Warn-App/build.gradle

...ronawarnapp.diagnosiskeys.storage.KeyCacheDatabase/1.json

...ki.coronawarnapp.storage.keycache.KeyCacheDatabase/1.json

...ronawarnapp/diagnosiskeys/storage/KeyCacheDatabaseTest.kt

.../de/rki/coronawarnapp/storage/keycache/KeyCacheDaoTest.kt

...java/de/rki/coronawarnapp/util/security/DBPasswordTest.kt

...e/rki/coronawarnapp/util/security/VerificationKeysTest.kt

...i/coronawarnapp/test/RiskLevelAndKeyRetrievalBenchmark.kt

...va/de/rki/coronawarnapp/test/api/ui/TestForAPIFragment.kt

...app/test/risklevel/ui/TestRiskLevelCalculationFragment.kt

...klevel/ui/TestRiskLevelCalculationFragmentCWAViewModel.kt

...c/deviceForTesters/res/layout/fragment_test_for_a_p_i.xml

...sters/res/layout/fragment_test_risk_level_calculation.xml

...arn-App/src/deviceForTesters/res/navigation/nav_graph.xml

...de/rki/coronawarnapp/diagnosiskeys/DiagnosisKeysModule.kt

...e/rki/coronawarnapp/diagnosiskeys/download/CountryData.kt

...coronawarnapp/diagnosiskeys/download/KeyFileDownloader.kt

.../rki/coronawarnapp/diagnosiskeys/server/AppConfigApiV1.kt

...rki/coronawarnapp/diagnosiskeys/server/AppConfigServer.kt