Unify Utils::ChangeSet usages

* Remove using Utils::ChangeSet from header files
* Remove unused typedef for Range
* Add it only in source files that contain many occurrences

Change-Id: I60a8b77e2d5a46431507f53b6d60186d511ccf30
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/cpptools/cpppointerdeclarationformatter_test.cpp

@@ -48,14 +48,10 @@ using namespace CPlusPlus;
 using namespace CppTools;
 using namespace CppTools::Internal;
 
-using Utils::ChangeSet;
-
 Q_DECLARE_METATYPE(Overview)
 
 namespace {
 
-typedef Utils::ChangeSet::Range Range;
-
 QString stripCursor(const QString &source)
 {
     QString copy(source);
@@ -127,7 +123,7 @@ public:
 
         // Run the formatter
         PointerDeclarationFormatter formatter(cppRefactoringFile, overview, cursorHandling);
-        ChangeSet change = formatter.format(ast); // ChangeSet may be empty.
+        Utils::ChangeSet change = formatter.format(ast); // ChangeSet may be empty.
 
         // Apply change
         QTextCursor changeCursor(textDocument);