VCS: 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: I061c7bdcade96961aed226a8348f8ab07ee95f5f
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/git/branchmodel.cpp

@@ -724,7 +724,7 @@ QString BranchModel::toolTip(const QString &sha) const
     QStringList arguments(QLatin1String("-n1"));
     arguments << sha;
     if (!m_client->synchronousLog(m_workingDirectory, arguments, &output, &errorMessage,
-                                  VcsBase::VcsBasePlugin::SuppressCommandLogging)) {
+                                  VcsBasePlugin::SuppressCommandLogging)) {
         return errorMessage;
     }
     return output;