📌 Use range for python_requires (#131)

🐛 Fix stm32f1::uart usart1 pin selection (#118)

Resolves #117

♻️ Changes all around (#110)

* ♻️ Changes all around

- Use manager paradigm for
- Add zero_copy_serial to usart
- power_on now throws an exception if the peripheral is already powered
  on
- configure_pin now throws if a pin isn't in its reset state when its
  called

* Move adc_manager ctor to protected region

* ✏️ Fix typos in documention

* Revert demos back to main

* ✏️ One last typo

* ♻️ Cleanup units and headers

✏️ Update stm32f1 timer files & variables (#102)

📝 Add stm32f1 series errata document (#95)

🐛 Add timeout ctor to `hal::stm32f1::can_peripheral_manager` (#91)

`hal::stm32f1::can_peripheral_manager` has its original constructor
deprecated and a new constructor accepting a `hal::steady_clock` and
timeout time. If exiting initialization takes longer than the time out
time, a `hal::timed_out` exception will be thrown.

In order to prevent applications unassociated from the can application
to continue to work as usual, a try/catch is put around the construction
of the `hal::stm32f1::can_peripheral_manager` object. If construction
fails, then none of the can interface optionals will be set and the
program will run without them. If the can application is executed and
the optionals are nullopt, then access will throw and will terminate
the application which is the intended behavior.

✨ Add UART to stm32f411 (#85)

- Add UART to stm32f411
- Fixed frequency() for the clock tree

🐛 Fix stm32f1::can_transceiver baud_rate() (#84)

🐛 Make libhal & libhal-util transitive (#82)

✨ Add split can implementation (#74)

* ✨ Add split can implementation

* Trying to get the filters to work. Not getting anything currently

* ✨ Filters are working. Need to test more