DBus activation with filemanager iface

The FileManager interface has a string for startupId, which is good.

It then gets completely ignored, which is bad.

We need to:

• patch dolphin's dbusinterface.cpp to call
  KWindowSystem::setCurrentXdgActivationToken()

with the startupID

• patch Dolphin::attachToExistingInstance to call
  KwindowSsytem::activateWindow()

• patch all users of KIO::highlightInFileManager to call
  KWindowSystem::requestActivationToken(..) and set the result as the startupID

frameworks/kio!554 (merged)