sm_selected: Check if select_multiple choices were selected
In mabafaba/composr: Compose new variables - horizontal recoding operations

Check if select_multiple choices were selected

1	sm_selected(x, any = NULL, all = NULL, exactly = NULL, none = NULL)

`x`	a vector of select multiple responses, with choices separated by spaces
`any`	TRUE if any of the values supplied here as a vector were selected
`all`	TRUE if all of the values supplied here as a vector were selected
`exactly`	TRUE if exactly all of the values supplied here as a vector were selected (an no others)
`any`	TRUE if none of the values supplied here as a vector were selected