* clif-util: do not convert `anyhow::Error`s into strings into `anyhow::Error`s * filetests: Use the debug formatting of `anyhow::Error`s This provides the full error context, not just the source error's message.
anyhow::Error
String
Also does the same for `cranelift-filetests`.
moved crates in lib/ to src/, renamed crates, modified some files' text (#660)
