R1:a56ca7a04398

Conpherence - kill the image-based header UI

Summary:
removes the whole custom image thing, instead using a more standard application crumbs. Gives this glorious space back to the compose area which is now tens of pixels taller. Also defaults it to the people widget. Basically, fixes T3160.

For now, you **CAN NOT** edit the title of a conpherence. I didn't want to jam in too much here. Next diff will be to change the widget icons into the dropdown switcher, which will also bring back the editing of…