MOVEONLY: Move balance and utxo RPCs to coins.cpp

Author: kwvg

src/Makefile.am

@@ -606,6 +606,7 @@ libbitcoin_wallet_a_SOURCES = \
   wallet/receive.cpp \
   wallet/rpc/addresses.cpp \
   wallet/rpc/backup.cpp \
+  wallet/rpc/coins.cpp \
   wallet/rpc/encrypt.cpp \
   wallet/rpc/signmessage.cpp \
   wallet/rpc/transactions.cpp \