json serialization for rpc-relevant monero types

Structured {de-,}serialization methods for (many new) types
which are used for requests or responses in the RPC.

New types include RPC requests and responses, and structs which compose
types within those.

# Conflicts:
#	src/cryptonote_core/blockchain.cpp

src/daemon/daemon.h

@@ -43,6 +43,8 @@ private:
   void stop_p2p();
 private:
   std::unique_ptr<t_internals> mp_internals;
+  std::string zmq_rpc_bind_address;
+  std::string zmq_rpc_bind_port;
 public:
   t_daemon(
       boost::program_options::variables_map const & vm