bridge, quick_frontend: preparation for async bridge bridge can currently have sync and async methods. This commit prepare the transition to fully async bridges: - a new bridgeConnect method must be called to prepare the bridge - quick app, quick profile manager: changed sync calls to async ones - quick app: bridgeConnect can be called automatically or manually depending on connect_bridge parameter of QuickApp

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