Reader#v3_entry

[rapodaca]

Consumes leading "M V30 " characters and one of the allowed names. If leading "M" not found, returns None. If "M V30 " is interrupted, returns Error. If an allowed name is not found or is interrupted, returns error.

Puts reader into a mode that will consume the character sequence "-{newline}M V30 ", setting row/column as needed.

Something like this might work:

pub fn v3_entry(
    &mut self,
    names: &'a [&'a [Character]],
) -> Result<&'a [Character], Error> {
    todo!()
}

TODO:

• Reader#expect #8