Move network-msg-processing code out of main to its own file

Author: TheBlueMatt

src/Makefile.am

@@ -109,6 +109,7 @@ BITCOIN_CORE_H = \
   merkleblock.h \
   miner.h \
   net.h \
+  net_processing.h \
   netaddress.h \
   netbase.h \
   netmessagemaker.h \
@@ -183,6 +184,7 @@ libbitcoin_server_a_SOURCES = \
   merkleblock.cpp \
   miner.cpp \
   net.cpp \
+  net_processing.cpp \
   noui.cpp \
   policy/fees.cpp \
   policy/policy.cpp \

src/bench/checkblock.cpp

@@ -6,6 +6,7 @@
 
 #include "chainparams.h"
 #include "main.h"
+#include "streams.h"
 #include "consensus/validation.h"
 
 namespace block_bench {

src/init.cpp

@@ -23,6 +23,7 @@
 #include "miner.h"
 #include "netbase.h"
 #include "net.h"
+#include "net_processing.h"
 #include "policy/policy.h"
 #include "rpc/server.h"
 #include "rpc/register.h"