Don't display Roster Item Exchange requests when loading from MAM
XEP-0144 Roster Item Exchange requests should not trigger a popup if they were loaded from MAM / history (or were sent more than x minutes/hours/seconds ago, where x is perhaps user-configurable).
The impetus for this suggestion comes from triggering a history sync using Advanced -> Synchronize History... and suddenly having ~100 XEP-0144 requests pop up from when I was debugging a transport earlier (!)