ProjectExplorer: 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: I1d05d48b23f44e3d589cc2a790803714786b57d2
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/projectexplorer/codestylesettingspropertiespage.cpp

@@ -46,7 +46,7 @@ CodeStyleSettingsWidget::CodeStyleSettingsWidget(Project *project) : QWidget(),
     const EditorConfiguration *config = m_project->editorConfiguration();
 
     QMap<Core::Id, ICodeStylePreferencesFactory *> factories
-            = TextEditor::TextEditorSettings::codeStyleFactories();
+            = TextEditorSettings::codeStyleFactories();
     QMapIterator<Core::Id, ICodeStylePreferencesFactory *> it(factories);
     while (it.hasNext()) {
         it.next();