Cleanup code using forward declarations.

Use misc methods of avoiding unnecesary header includes.
Replace int typedefs with int##_t from stdint.h.
Replace PRI64[xdu] with PRI[xdu]64 from inttypes.h.
Normalize QT_VERSION ifs where possible.
Resolve some indirect dependencies as direct ones.
Remove extern declarations from .cpp files.

src/protocol.cpp

@@ -4,8 +4,10 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "protocol.h"
+
 #include "util.h"
-#include "netbase.h"
+
+#include <stdint.h>
 
 #ifndef WIN32
 # include <arpa/inet.h>
@@ -81,7 +83,7 @@ CAddress::CAddress() : CService()
     Init();
 }
 
-CAddress::CAddress(CService ipIn, uint64 nServicesIn) : CService(ipIn)
+CAddress::CAddress(CService ipIn, uint64_t nServicesIn) : CService(ipIn)
 {
     Init();
     nServices = nServicesIn;