add ReceiverSatellite

Alternative to !322 (closed) and !178 (closed) for data receiver in C++. Inspired by !322 (closed)'s approach to use the BasePool.

Things to do:

• Add initializing_receiver et al functions
• Start and stop basepool
• Wait for EORs in stopping
• Think about error in running
• Filter to which satellites to connect to
• Send CHIRP request for DATA (done by BasePool)
• Add logic to check state of each sending satellite
• Add DevNull satellite
• Properly wait for EOR messages by checking the poller
• Check sequence number in receiver satellite
• Add tests
• Add documentation