Add support for Omny.fm

Please consider adding support for Omny.fm podcasts and audio files.

Example podcast: https://omny.fm/shows/the-talking-point/public-service-precautionary-sus...
Example iframe:
<iframe src="https://omny.fm/shows/the-talking-point/public-service-precautionary-suspensions-impeding/embed?style=Cover" width="100%" height="180" allow="autoplay; clipboard-write" frameborder="0" title="Public service precautionary suspensions impeding service delivery & costing taxpayer"></iframe>