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Initial 0.5.0 beta, after SDK-style migration and new versioning scheme

Fixed bug on Connect Flow

- For the particular case where the user session was preserved on connection (by using CleanSession = false) and there were pending messages to deliver by the Broker (pending Publish or Ack messages),
then the Server Connect Flow was failing because the pending messages were sent before the Connect Ack, which is a violation of the MQTT protocol, where it says that the first message that the Server must send is a Connect Ack

- Added a proper Unit Test to detect and cover this case

Changes on transport layer

- Removed dependency over ReactiveSockets
- Added TcpChannel as an adapter of TcpClient to replace ReactiveSocket
- Applied Disposable pattern over all the Channel implementations

Fix references to resolve always to $(SolutionDir)

Initial version