Plugins don't need their own copies of configs and properties.

api/net/sf/briar/api/plugins/BatchTransportCallback.java

api/net/sf/briar/api/plugins/StreamTransportCallback.java

api/net/sf/briar/api/plugins/TransportCallback.java

api/net/sf/briar/api/plugins/TransportPlugin.java

api/net/sf/briar/api/transport/TransportCallback.java

components/net/sf/briar/plugins/AbstractPlugin.java

...nents/net/sf/briar/plugins/bluetooth/BluetoothPlugin.java

...nents/net/sf/briar/plugins/file/RemovableDrivePlugin.java

...nents/net/sf/briar/plugins/socket/SimpleSocketPlugin.java

components/net/sf/briar/plugins/socket/SocketPlugin.java

test/net/sf/briar/plugins/bluetooth/BluetoothClientTest.java

test/net/sf/briar/plugins/bluetooth/BluetoothServerTest.java

test/net/sf/briar/plugins/file/RemovableDrivePluginTest.java

test/net/sf/briar/plugins/socket/SimpleSocketPluginTest.java