Factor version number out in C++ code

* Fewer places to update with the version number.
* Linux can now use this natively rather than passing via Makefile var

renderdoc/core/core.cpp

@@ -30,10 +30,7 @@
 
 #include <time.h>
 
-#ifdef WIN32
-#include "data/resource.h"
-#endif
-
+#include "data/version.h"
 #include "crash_handler.h"
 
 template<>