[TASK] Fix TYPO3 6.1+ compat, remove dependencies to EXT:fed

I made all the fixes for TYPO3 6.1+ and completely removed the dependencies to EXT:fed
Where I could find a fitting ViewHelper in current EXT:vhs, I used that one, where I couldn't, I copied the ViewHelper to EXT:notify. Furthermore I copied needed services from EXT:fed to EXT:notify.
This should probably just be typed as full class names below instead of imported here - if nothing else then just for consistency with all the other updates, but should also make it easier if/when the extension gets converted to namespaces.