frontends: callback are now always used in QuickApp launchAction (before it was only used if validated is present): - actionManager is used by default (no callback provided) - in XMLUI, the dialog is closed before calling actionManager - if keys are not managed in resuling data, an exceptions is raised

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