Various clippy lints

members/lexers/src/arguments.rs

members/lexers/src/assignments/keys.rs

src/lib/parser/assignments/actions.rs

src/lib/parser/quotes.rs

src/lib/shell/assignments.rs

src/lib/shell/binary/terminate.rs

src/lib/shell/flow.rs

src/lib/shell/pipe_exec/job_control.rs

src/lib/shell/pipe_exec/mod.rs

src/lib/shell/pipe_exec/pipes.rs

src/lib/shell/pipe_exec/streams.rs