c125c46010
- Add short options as valid tokens in a `CommandModel` so that Lexer create tokens with accurate info and doesn't then cascade this issue in Ast and Parser. - Previously with a command `command -a aaa -b bbb` tokenisation resulted `COMMAND OPTION ARGUMENT ARGUMENT ARGUMENT` with multiple short options while it should have been `COMMAND OPTION ARGUMENT OPTION ARGUMENT`. - Relates #757