Licences for videos

[KubaMikolajczyk]

Currently we force user to choose from a lot of licences during the joystream bugbash we proposed to make a default values for licences.

This is a broader topic and the approach has to be defined and discussed.

[bedeho]

Best approach is to select a default license, like YT does, and allow user to override.

[kdembler]

This has been already designed and implemented