Reference ids without at symbol (@)

For example, something that allows you to do:
- `timew stop 1; timew move 2 3pm`

Instead of:
- `timew stop @1; timew move @2 3pm`

This would be similar to Taskwarrior, in which you just pass the ID number.

No files, tests, or entry points are named in the issue. Start by locating the command-line parsing and reference-ID handling for commands such as `timew stop` and `timew move`; done means numeric IDs work without `@` while existing `@` references continue to work.

Written by the indexing model from the issue text.