[SDESK-6146] Support seeking video files through partial requests (#2280)
[SDESK-6146] Support seeking video files through partial requests (#2280)


petrjasek/superdesk-core,superdesk/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core