build: search headers in all source directories

* removed paths in include directives
* changed cmake to provide necessary header search paths
* changed name of version.h to productVersion.h due to name conflict

src/lib/utility/utilityCxx.cpp

@@ -1,7 +1,7 @@
-#include "utility/utilityCxx.h"
+#include "utilityCxx.h"
 
-#include "utility/ResourcePaths.h"
-#include "utility/utilityApp.h"
+#include "ResourcePaths.h"
+#include "utilityApp.h"
 
 namespace utility
 {