SVD Expander

This crate expands arrays and inheritance chains in CMSIS-SVD specifications.

Example usage:

```rust use std::fs::File; use std::io::Read; use svd_expander::DeviceSpec;

fn main() { let xml = &mut String::new();

File::open("./stm32f303.svd")
    .unwrap()
    .read_to_string(xml)
    .unwrap();

println!("{:#?}", DeviceSpec::from_xml(xml));

} ```