feat(StatementBrowser): video previews for multiple platforms including the TIB AV portal
URLs of videos from the TIB AV portal will be embedded automatically. This is related to issue #71
For example: When the following literal is used: https://av.tib.eu/media/41640
It is converted to a embedded video player automatically:
The preview function is generalized to support other video platforms as well: Youtube, Dailymotion and Vimeo