This merge request contains the feature to login in ERP5 with Google Account.

Also, this branch is based on the work done in !185 (merged)

We have a lot of discussion about this changes in !179 (closed), 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

/cc @tb @romain @rafael @kazuhiko @vincent @jerome