Support Google login in ERP5
This merge request contains the feature to login in ERP5 with Google Account.
Also, this branch is based on the work done in https://lab.nexedi.com/nexedi/erp5/merge_requests/185
We have a lot of discussion about this changes in https://lab.nexedi.com/nexedi/erp5/merge_requests/179, but with a lot of merge conflicts, a new MR is better to review.
This branch will wake up the discuss of "Moving API Keys from preference to a better place", I can work on it but I am not sure if we have a good design yet.
Any comment is welcome