Apply rustfmt & Close #602

rustfmt.toml

src/builtins/exists.rs

src/builtins/mod.rs

src/builtins/random.rs

src/parser/arguments.rs

src/parser/assignments/actions.rs

src/parser/assignments/keys.rs

src/parser/loops/for_grammar.rs

src/parser/pipelines/mod.rs

src/parser/shell_expand/mod.rs

src/parser/shell_expand/words/methods/strings.rs

src/parser/shell_expand/words/mod.rs

src/parser/shell_expand/words/range.rs

src/parser/statement/functions.rs

src/parser/statement/parse.rs

src/shell/binary/designators.rs

src/shell/colors.rs

src/shell/flow.rs

src/shell/flow_control.rs

src/shell/history.rs