Feature Request: Add keepawake-rs to prevent system suspend during encodes

[Bl4cKn1gh7]

I've been using keepawake on windows during encodes to prevent my system from sleeping during encodes. Its cross platform and there's a rust crate available, so it might be a solid addition for convenience.

I use the idle option so the display still turns off which is reasonable, though apparently the difference between idle and sleep varies depending on OS according to upstream.