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/settings/Settings.cpp

@@ -1,8 +1,8 @@
-#include "settings/Settings.h"
+#include "Settings.h"
 
-#include "utility/logging/logging.h"
-#include "utility/text/TextAccess.h"
-#include "utility/utility.h"
+#include "logging.h"
+#include "TextAccess.h"
+#include "utility.h"
 
 Settings::Settings(const Settings& other)
 	: m_config(other.m_config->createCopy())