Yag v0.9.7.1 on beta branch

Hey,

Yag v0.9.7.1 is on the beta branch.

https://www.youtube.com/watch?v=8xweldvVEWs

It's big update :-)
- first step toward modular content
- a lot of new content (SciFi)
- new skies
- color filters

https://imgur.com/a/MBmbrwx

Cheers
Cedric