C++: Introduce PointerDeclarationFormatter

For a given AST, CppRefactoringFile and Overview this will create a
ChangeSet for rewriting the pointer or reference declaration according
to the Overview.

Task-number: QTCREATORBUG-6169

Change-Id: If6f824c1ea5e9f53a11a58ec8b6d696d01f0723e
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/libs/cplusplus/Overview.h

@@ -49,9 +49,6 @@ namespace CPlusPlus {
 
 class CPLUSPLUS_EXPORT Overview
 {
-    Overview(const Overview &other);
-    void operator =(const Overview &other);
-
 public:
     Overview();