OpenACS

since this editor now seems to enjoy somewhat better support, I have "borrowed" much of the logic available in richtext-ckeditor4 so that users can keep their editor version up to date.

Notable changes:

- we do not ship the actual Xinha editor ourselves, it will by default come from the cdn (on Amazon servers) or can be downloaded locally as we do for CKEditor4

- plugins that have been developed specifically for OpenACS (which seem to keep working) are now maintained in a separate folder tree and configured in the editor specifically

- The configuration for which plugins should be available is now maintained at the package level

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