Set NoQt as qt version for non-qt projects

Change-Id: I292357c84f3633ffc3cb17f44b66d6de9c268966
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/plugins/cpptools/ModelManagerInterface.cpp

@@ -32,6 +32,20 @@
 
 #include <QtCore/QSet>
 
+/*!
+    \enum CPlusPlus::CppModelManagerInterface::QtVersion
+    Allows C++ parser engine to inject headers or change inner settings as
+    needed to parse Qt language extensions for concrete major Qt version
+    \value UnknownQt
+           Parser may choose any policy
+    \value NoQt
+           Parser must not use special tricks, because it parses non-qt project
+    \value Qt4
+           Parser may enable tricks for Qt v4.x
+    \value Qt5
+           Parser may enable tricks for Qt v5.x
+*/
+
 using namespace CPlusPlus;
 
 static CppModelManagerInterface *g_instance = 0;