Let cloud smoother change when mesh has refresh.
Maybe needs two cloud mesh data group to cross fading.

https://github.com/Rivmun/SuperFancyCloudsRefabricated/tree/dev/fading-feature
Sadly, I cannot implement this feature without any issue for now:

• cloud will flicker when position offset increase.
• cloud will disappear when player across chunk border. (after 1.7.2)
• fading cloud face will show sky instead of other faces behind.

Will merged this branch and marked this feature by Experimental in #44