C++: Remove unneeded qualifications

Mostly done using the following ruby script:
Dir.glob('**/*.cpp').each { |file|
  next if file =~ %r{src/shared/qbs|/qmljs/}
  s = File.read(file)
  s.scan(/^using namespace (.*);$/) {
    ns = $1
    t = s.gsub(/^(.*)\b#{ns}::((?!Const)[A-Z])/) { |m|
      before = $1
      char = $2
      if before =~ /"|\/\/|\\|using|SIGNAL|SLOT|Q_/
        m
      else
        before + char
      end
    }
    if t != s
      puts file
      File.open(file, 'w').write(t)
    end
  }
}

Change-Id: I6fbe13ddc1485efe95c3156097bf41d90c0febac
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/plugins/cpptools/cpprefactoringchanges.cpp

@@ -40,9 +40,10 @@
 #include <utils/qtcassert.h>
 
 using namespace CPlusPlus;
-using namespace CppTools;
 
-class CppTools::CppRefactoringChangesData : public TextEditor::RefactoringChangesData
+namespace CppTools {
+
+class CppRefactoringChangesData : public TextEditor::RefactoringChangesData
 {
 public:
     CppRefactoringChangesData(const Snapshot &snapshot)
@@ -262,3 +263,5 @@ void CppRefactoringFile::fileChanged()
     m_cppDocument.clear();
     RefactoringFile::fileChanged();
 }
+
+} // namespace CppTools