Merge branch '1802-sync-via-removable-storage' into 'master'

...ject/bramble/plugin/bluetooth/AndroidBluetoothPlugin.java

...amble/plugin/bluetooth/AndroidBluetoothPluginFactory.java

...ject/bramble/plugin/file/AndroidRemovableDrivePlugin.java

...amble/plugin/file/AndroidRemovableDrivePluginFactory.java

.../briarproject/bramble/plugin/tcp/AndroidLanTcpPlugin.java

...roject/bramble/plugin/tcp/AndroidLanTcpPluginFactory.java

...org/briarproject/bramble/plugin/tor/AndroidTorPlugin.java

...arproject/bramble/plugin/tor/AndroidTorPluginFactory.java

.../src/main/java/org/briarproject/bramble/api/Consumer.java

.../main/java/org/briarproject/bramble/api/FeatureFlags.java

...iarproject/bramble/api/client/BdfIncomingMessageHook.java

...n/java/org/briarproject/bramble/api/crypto/SecretKey.java

...va/org/briarproject/bramble/api/db/DatabaseComponent.java

.../briarproject/bramble/api/lifecycle/LifecycleManager.java

...main/java/org/briarproject/bramble/api/plugin/Plugin.java

...va/org/briarproject/bramble/api/plugin/PluginFactory.java

...project/bramble/api/plugin/TransportConnectionWriter.java

.../api/plugin/duplex/AbstractDuplexTransportConnection.java

...roject/bramble/api/plugin/duplex/DuplexPluginFactory.java

...g/briarproject/bramble/api/plugin/file/FileConstants.java