Pyweatherflowudp

- Fix `vapor_pressure` property calculation

- Add `power_save_mode` property to Tempest devices

- Support Pint >=0.19

- Adjusted logic for `heat_index` to match [WeatherFlow documentation](https://weatherflow.github.io/Tempest/api/derived-metric-formulas.html#heat-index)
- Add `feels_like_temperature` to calc.py

- Adjusted logic for calculate_sea_level_pressure to match [WeatherFlow documentation](https://weatherflow.github.io/Tempest/api/derived-metric-formulas.html#sea-level-pressure)

- Adjusted logic for `wind_direction` and `wind_direction_cardinal` to report based on the last wind event or observation, whichever is most recent (similar to `wind_speed`)
- Added properties for `wind_direction_average` and `wind_direction_average_cardinal` to report only on the average wind direction
- Handle UnicodeDecodeError during message processing
- Bump Pint to ^0.19

Breaking Changes:

- The properties `wind_direction` and `wind_direction_cardinal` now report based on the last wind event or observation, whichever is most recent. If you want the wind direction average (previous logic), please use the properties `wind_direction_average` and `wind_direction_average_cardinal`, respectively
- The default symbol for `rain_rate` is now `mm/h` instead of `mm/hr` due to Pint 0.19 - https://github.com/hgrecco/pint/pull/1454