Implement basic bitcoind serialization annotations/tests.

Author: evoskuil

Makefile.am

@@ -543,6 +543,7 @@ include_bitcoin_system_chain_json_HEADERS = \
     include/bitcoin/system/chain/json/header.hpp \
     include/bitcoin/system/chain/json/input.hpp \
     include/bitcoin/system/chain/json/json.hpp \
+    include/bitcoin/system/chain/json/macros.hpp \
     include/bitcoin/system/chain/json/operation.hpp \
     include/bitcoin/system/chain/json/outpoint.hpp \
     include/bitcoin/system/chain/json/output.hpp \