* convert wasi-common from defining its own error to using wiggle trappable error * wasi-common impl crates: switch error strategy * wasmtime-wasi: error is trappable, and no longer requires UserErrorConversion * docs * typo * readdir: windows fixes * fix windows scheduler errors fun fact! the Send and Recv errors here that just had a `.context` on them were previously not being captured in the downcasting either. They need to be traps, and would have ended up that way by ommission, but you'd never actually know that by reading the code!
Crate defining the Wasi type for Wasmtime, which represents a WASI
instance which may be added to a linker.