Introduce verbose mode that shows which options are used

```console
$ next-action -v @phone
options: number: 1, file: ~/todo.txt, filters: @phone
Call mom @phone
$ next-action -vv @phone
options: number: 1 [default], file: ~/todo.txt [~/.next-action.cfg], filters: @phone [command-line] ...
Call mom @phone
``` 