Release v6.1.0

• (@GermanBluefox) The test harness now captures the log output of the adapter under test. It can be checked with the new methods harness.getLogs(), harness.hasLog() and harness.clearLogs()
• (@GermanBluefox) BREAKING: harness.changeAdapterConfig() now automatically encrypts the native properties that are listed in the instance object's encryptedNative. Tests that encrypted such values themselves must pass them in plain text now
• (@GermanBluefox) Added harness.getAdapterConfig(), which reads the instance object and decrypts the encryptedNative properties
• (@GermanBluefox) Added harness.encryptValue() and harness.decryptValue() for manual encryption/decryption
• (@copilot) The integration test directory is now cleaned up automatically when the requested js-controller version differs from the one installed by the previous run