Parsing to have a simple Blueprint Editor

To avoid having to write code to define a Blueprint, I wrote a parser for a very simple text format.
A character represents the structure type, whitespace indicates free areas.
Since there’s currently only support for the Module Structure, a text definition and parsing might look like this:

    let bp = Blueprint::parse(
        "MMMMMMMMMM\
        MMMMMMMMMM\
        MMMM MMMMM\
        MMMMMMMMMM\
        MMMMMMMMMM\
        MMMMMMMMMM\
        MMMMMMMMMM\
        MMMMMMMMMM\
        MMMMMMMMMM\
        MMMMMMMMMM",
    )
    .unwrap();