This is a first version of the "official" JSON Editor to be used on ERP5.

This first version replaces the parameter editor on slapos erp5 from the existing testing coverage.

It is important to remark that it still lacks a better support of oneOf, on the current release but it can handle most of our current usage on SlapOS side.

I propose merge this version since it is compatible and tested on slapos erp5 (master) test suite, them iterate to cover more generic use cases and have fixes (like oneOf) that isn't working anyway on the current editor.