CppTools: Move CppHoverHandler to CppTools

This is in preparation for clang code model to provide its own hover
handler.

Change-Id: Ifbdd96f427989bd5d1fbc4badb9c38108485c2f2
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/cpptools/cppmodelmanagersupportinternal.cpp

@@ -26,6 +26,7 @@
 #include "cppcompletionassist.h"
 #include "cppmodelmanagersupportinternal.h"
 #include "cppfollowsymbolundercursor.h"
+#include "cpphoverhandler.h"
 #include "cpprefactoringengine.h"
 #include "builtineditordocumentprocessor.h"
 
@@ -74,6 +75,11 @@ CppCompletionAssistProvider *ModelManagerSupportInternal::completionAssistProvid
     return m_completionAssistProvider.data();
 }
 
+TextEditor::BaseHoverHandler *ModelManagerSupportInternal::createHoverHandler()
+{
+    return new CppHoverHandler;
+}
+
 FollowSymbolInterface &ModelManagerSupportInternal::followSymbolInterface()
 {
     return *m_followSymbol;