Decoupled ProtocolReader (which belongs in the protocol component)

api/net/sf/briar/api/protocol/ProtocolReader.java

api/net/sf/briar/api/protocol/ProtocolReaderFactory.java

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

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

components/net/sf/briar/protocol/ProtocolModule.java

...ents/net/sf/briar/protocol/ProtocolReaderFactoryImpl.java

components/net/sf/briar/protocol/ProtocolReaderImpl.java

components/net/sf/briar/transport/PacketDecrypter.java

components/net/sf/briar/transport/PacketDecrypterImpl.java

...nents/net/sf/briar/transport/PacketReaderFactoryImpl.java

components/net/sf/briar/transport/PacketReaderImpl.java

components/net/sf/briar/transport/PacketWriterImpl.java

test/build.xml

test/net/sf/briar/FileReadWriteTest.java

test/net/sf/briar/transport/PacketReadWriteTest.java

test/net/sf/briar/transport/PacketReaderImplTest.java

test/net/sf/briar/transport/PacketWriterImplTest.java