Replace circular-queue

The circular-queue crate, https://crates.io/crates/circular-queue, has not been updated in over four years. Probably a good idea to look for an alternative. It's used for dither and delay filters. Could be https://crates.io/crates/circular-buffer or https://docs.rs/ringbuf/0.4.7/ringbuf/ or maybe a standard VecDeque is enough.