XWIKI-17145: Add support for editing in-place the wiki pages for which the...

XWIKI-17145: Add support for editing in-place the wiki pages for which the default edit mode is WYSIWYG
* Modify actionButtons.js to be able to use it for in-place editing
** Bulletproof the usage of form since we don't have a form in view mode (and refactoring actionButtons.js completely is too dangerous ATM)
** Cancel the form only when there's a form present
** Hide the notifications after a successful Save & View also (not just for Save & Continue)
** on403 without (CSRF) JSON response triggers 2 xwiki:document:saveFailed events (because it calls on401)