Bitcoin-Qt (Windows only): add version info to Resource File

- add version information to bitcoin-qt.rc, which is displayed on Windows, when looking in the executable properties and selecting "Details"
- introduce a new clientversion.h (used in bitcoin-qt.rc to generate
  version information), which takes only the version defines from
  version.h and is included in it (to allow usage with the windres rc-file
  compiler)
- move #define STRINGIFY(s) #s into clientversion.h as that is used in
  bitcoin-qt.rc and rename to DO_STRINGIZE(X)
- add #define STRINGIZE(X) DO_STRINGIZE(X), which is needed to convert the
  version defines into a version string in the rc-file
- this ensures we only need to update 1 file and have bitcoin-qt.exe
  version information

- for RC-file documentation see:
  http://msdn.microsoft.com/en-us/library/windows/desktop/aa381058%28v=vs.85%29.aspx

src/version.h

@@ -4,21 +4,16 @@
 #ifndef BITCOIN_VERSION_H
 #define BITCOIN_VERSION_H
 
+#include "clientversion.h"
 #include <string>
 
 //
 // client versioning
 //
 
-// These need to be macros, as version.cpp's voodoo requires it
-#define CLIENT_VERSION_MAJOR       0
-#define CLIENT_VERSION_MINOR       7
-#define CLIENT_VERSION_REVISION    0
-#define CLIENT_VERSION_BUILD       2
-
 static const int CLIENT_VERSION =
                            1000000 * CLIENT_VERSION_MAJOR
-                         +   10000 * CLIENT_VERSION_MINOR 
+                         +   10000 * CLIENT_VERSION_MINOR
                          +     100 * CLIENT_VERSION_REVISION
                          +       1 * CLIENT_VERSION_BUILD;