YouTube Sync: Conditional Synchronization

[maltfield]

Describe the problem to be solved

Currently, if you're able to get the YouTube synchronization to work at all, it syncs all videos from a channel.

But a user may only want a subset of the videos.

Describe the solution you would like

Solution: let's let the user define some conditionals to decide which videos to sync from YouTube to PeerTube:

1. Exclude Videos with title that match user-defined regex
2. Only sync videos with title that match user-defined regex
3. Only sync videos that have user-defined license
4. Exclude videos that exceed X bytes in size
5. Exclude videos that exceed Y seconds in length