Set dummy conference info as a null core.
Load new items in case of chaning dates.
Allow gui to load until current date.
Fix video direction on screensharing.
Update SDK for tone indication on meetings.
Clean
conf creation loading+error; fix info popup layout
move contact edition in contact page (switch to contact tab if creation requested)
fix contact creation + select new contact on creation
conference info list : creation signal (to finish when conference scheduler is updated, see comment)
fix crash if no vcard
fix calendar ui
+spacings
layout polish (! on string in meetinglist)
