Merge #266

266: Implement InterruptNumber for bare_metal::Nr r=therealprof a=adamgreig

This PR aims to help backwards compatibility by implementing the new `InterruptNumber` trait (coming in cortex-m 0.7) for the old `bare_metal::Nr` trait. With this included in cortex-m 0.7, existing PACs generated from the current svd2rust (0.17) will work with cortex-m 0.7, and new PACs generated from a to-be-released svd2rust which uses `InterruptNumber directly will also work.

We can then remove this implementation in cortex-m 0.8 and upgrade cortex-m to depend on bare-metal 1.0 (or not depend on it at all) at that time.

With this PR in place, the upgrade path looks like:

* We release cortex-m 0.7, which users can upgrade to without needing a new PAC
* We release svd2rust 0.18, which will generate new PACs
* PACs update, now requiring cortex-m 0.7
* Users can update their PAC so long as they've already upgraded to cortex-m 0.7
* For cortex-m 0.8, we drop this impl and move off bare-metal 0.2, and a new PAC is required to use 0.8 onwards

Co-authored-by: Adam Greig <adam@adamgreig.com>

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