Overleaf 2021-05 with Rhodecode/Github support

Update: on May 31, 2021, Overleaf added reCAPTCHA to their login page after suffering a cyberattack. This currently breaks this tool. Stay tuned for an update.
Note: I found a small bug that could impact those who push shared Overleaf projects to the same remote as other users. I have implemented a fix, but given the above login issue, I cannot test it. Stay tuned.

This version adds support for selection of local backup location for each project, and push to a Github or Rhodecode remote.
Please see the README for details.