core (xmlui): new deferredUI method allows to manage XMLUI with a Deferred insteand of manual submit_id handling: - this differ from deferXMLUI, as it can be used in ui returned to frontend after a bridge call (deferXMLUI use actionNew only) - the "chained" argument allow to manage series of XMLUIs - this argument is also present in deferXMLUI

Use this module to temporary store files that need to be integrated to other
projects such as Wokkel.

For example, the changeset that introduced this folder adds RSM (XEP-0059)
support to Wokkel. The files in sat.tmp.wokkel are imported over the initial
wokkel files from sat.plugins.__init__.py