Merge branch 'terminator-iterator' into 'master'

benches/herestring.ion

benches/terminator.rs

benches/test.ion

members/lexers/src/arguments.rs

members/lexers/src/assignments/keys.rs

members/ranges/src/parse.rs

src/lib/builtins/mod.rs

src/lib/parser/assignments/actions.rs

src/lib/parser/assignments/checker.rs

src/lib/parser/pipelines/collector.rs

src/lib/parser/quotes.rs

src/lib/parser/shell_expand/mod.rs

src/lib/shell/assignments.rs

src/lib/shell/binary/mod.rs

src/lib/shell/binary/readln.rs

src/lib/shell/binary/terminate.rs

src/lib/shell/flow.rs

src/lib/shell/mod.rs

src/lib/shell/pipe_exec/job_control.rs

src/lib/shell/pipe_exec/mod.rs