Commit message:
Done:
- Introduce (incomplete) secure connection classes
- Start work on session tokens (for android)

TODO:
- Finnish secure connection classes
- Finnish session tokens system:
	* Make sure user gets all necessary updates when receiving new
	  handler (ServerConnectionHandler:114)
	* Pass connection and received object to correct handler when
	  detected (ServerConnectionHandler:106)
	* Create system for assigning session tokens to new connections,
	  and send them to the client