Build ppv2 headers to write

[misalcedo]

The goal is to make writer an enum of either a vec or box dyn write.

Then to create a from impl for write, create a new with builder method, and expose the write header method as having arguments.

Finally flush the writer in build

[misalcedo]

The formatter for implementing std::fmt traits is the closest thing to what we care about in Writer:

pub struct Formatter<'a> {
    flags: u32,
    fill: char,
    align: rt::v1::Alignment,
    width: Option<usize>,
    precision: Option<usize>,

    buf: &'a mut (dyn Write + 'a),
}

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