NXP-12151 fix videoplayer thumbnail display on DAM
NXP-12159: use dedicated event for async processing of video documents (conversions, storyboard, preview)
NXP-12073: remove default @font-face from 'video-js.css' file, keep only the one from 'video-js.nx.css'
NXP-12073 fix reloading of thumbnail plugin
NXP-12073: extend drom an empty {} when creating the settings