Updated enable GUI test page and documentation
updated capture-thumb docs
updated docs to mention KS
fix getSources to include HD / web flavors
Merge branch '2.20-Oct-19' into 2.21-Nov-16
SUP-2429 #comment Hide screen until seek is completed #time 4h
FEC-2019 #comment Fix ad playback on non sibling player #time 4h

On non sibling ad player pausePlayBtn behaviour is broken when
returning to player after clickthrough
Merge pull request #1099 from kaltura/FEC-2019

FEC-2019 #comment Fix ad playback on non sibling player #time 4h
Merge pull request #1098 from kaltura/SUP-2429

SUP-2429 #comment Hide screen until seek is completed #time 4h
Merge branch '2.21-Nov-16' into hide-controls-no-movement