Support for pregchan and chonyuu

[Yumae]

Pregchan: https://pregchan.com/ Or the revamped site: https://new.pregchan.com

Chonyuu: https://g.chounyuu.com/directory

Chonyuu looks a bit different from a regular chan but it seems to work in a somewhat similar way aside from the fact that there's only one "board". Pregchan on the other hand should be easier to implement since it has a more standard layout with several boards.

[K1rakishou]

Yeah I'm not touching those that's for sure.