Shadow Flicker Manual Fixes

[PabloMack]

I just spent a whole working day fixing the shadow flicker on a 10-second animation. Sure would be nice if I didn't have to do this. 

[Hetzen]

I hate frame painting, and I bet you do now, especially when I think Ray Detail Region Padding in the Advanced render setting could have solved this.

[Oshyan]

What kind of shadow flicker? Ray Detail Region Padding only helps with out-of-frame geometry shadow casting. It's not going to help with GI or anything.

- Oshyan