quick_xml is way faster than xml-rs
Here is an example with a quick atom parser:
With xml-rs:
test parse_factorio_atom ... bench: 3,295,678 ns/iter (+/- 165,851)
With quick_xml:
test parse_factorio_atom ... bench: 203,215 ns/iter (+/- 13,485)
Unfortunately I had to break the API for this change to happen.
* Element::from_reader now takes `R: BufRead` instead of `R: Read`
* Element::write_to now takes `W: io::Write` instead of `EventWriter<W: Write>`
This migration also allow us to have a write_to function which assumes
we're already in a given namespace (see `write_to_in_namespace`).
This way we don't need to reimplement PartialEq for Element. It's also
way easier to get an attribute by name as we don't need to iterate over
every attribute to see if it exists.
The only side effect is that now, in the Debug output, attributes are
automatically sorted by names instead of being sorted by insertion
order.
Fixes#4
