Only trigger pre/post for ad cuepoints

Include other cue points in miroll cue points
Bind cue point events in live mode

Even if cue points are initial empty
Fix live webcast slide display

Add support for webcast that start with no slides and for real time
slide rendering
Revert "FEC-2191 #comment Relocated chapters button #time 1h"

This reverts commit f0e0dbd240d375a563af2f9fc53d717de1e515c7.