* Implement half_period_counter in rtic-time
* Rename compute_now to calculate_now, use it in stm32 and imxrt
* Add more tests
* Add some docs
* Fix clippy warning, add imxrt timer to monotonics tests
* Bump dependency version to make sure monotonics will build properly
* Add changelog to rtic-monotonics
* Add more docs
* Add more docs
* Finish documentation
* Fix typos
* Switch from atomic-polyfill to portable-atomic
* Some more doc fixes
* More doc fixes
* Minor doc fix
* Minor doc fix
* Fix Atomics not existing
* Fix example
* Minor example improvement
* Revert back to atomic-polyfill
* Fix cargo.toml formatting
* Remove atomic-polyfill
* Attempt to fix unused macro warning
* Remove atomics completely from half period counter
* Minor doc fix
* Doc fixes
* Doc fixes
* Remove obsolete comment
* Fix ordering in monotonic initialization sequence
