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/alert.h

@@ -6,13 +6,20 @@
 #ifndef _BITCOINALERT_H_
 #define _BITCOINALERT_H_ 1
 
+#include "serialize.h"
+#include "sync.h"
+
+#include <map>
 #include <set>
+#include <stdint.h>
 #include <string>
 
-#include "uint256.h"
-#include "util.h"
-
+class CAlert;
 class CNode;
+class uint256;
+
+extern std::map<uint256, CAlert> mapAlerts;
+extern CCriticalSection cs_mapAlerts;
 
 /** Alerts are for notifying old versions if they become too obsolete and
  * need to upgrade.  The message is displayed in the status bar.
@@ -24,8 +31,8 @@ class CUnsignedAlert
 {
 public:
     int nVersion;
-    int64 nRelayUntil;      // when newer nodes stop relaying to newer nodes
-    int64 nExpiration;
+    int64_t nRelayUntil;      // when newer nodes stop relaying to newer nodes
+    int64_t nExpiration;
     int nID;
     int nCancel;
     std::set<int> setCancel;