Pioreactor

- Added more error codes for the ADC, network issues, and high temperature
- Reduce chance of running multiple growth_rate_calculating jobs
- Custom exceptions thrown in the Python software.
- New checks for HAT being present, and Heating PCB being present, before a job is run (if required in the job).
- QOL improvements to stirring calibration
- Calibrations now store the data locally, alongside the calibration results, in the local storage.
- New API in `DosingController` to add custom pumps
- Some `job_name`s are disallowed to avoid MQTT conflicts
- ADCReader now will estimate the local AC hertz to get a better OD reading signal.
- Custom Python exceptions were introduced.
- `pioreactor.hardware_mappings` is renamed to `pioreactor.hardware`
- New `is_HAT_present` and `is_heating_pcb_present` functions
- ErrorCodes is gone - use global variables in error_codes
- Adding logic for 180° sensor to growth_rate_calculating
- Pumps now have a state broadcast to MQTT, and thus can be "disconnected" over MQTT.
- Improved the response time of stopping pumps from the web UI.

- improved temperature-recording frequency (10m to 4m)
- removed the PWM's DC maximum on the heating output.
- New `pioreactor.version.hardware_verion` which reads from the HAT's EEPROM which version
of board is being used.
- removed PD channels 3 & 4.
- `angle` column in `od_readings_raw` table in database is now an integer.

- `pid_stable` automation renamed to `stable`
- jobs can now publish to `pioreactor/<unit>/+/monitor/flicker_led_with_error_code/<error code>`
to have the LED flash a specific error code.
- fixed errors raised when not able to connect to leader's MQTT
- improvements to error handling in monitor job.
- replaced `turn_off_leds_temporarily` with the more useful and more general `change_leds_intensities_temporarily`
- UX improvements to the `pump_calibration` action
- improving \*-Controller jobs:
- `automation` is now a dict attribute (json in MQTT)
- `automation_name` is a new published_setting, with string. This is what is read from the UI.
- CLI has a slightly changed API to pick the automation
- `pio_jobs_running` renamed to `pio_processes_running`

- a version cut to test building images

- too much to list

- New plugin architecture
- New database tables: `od_reading_statistics`, `stirring_rates`
- New `pio` commands: `install-plugin`, `uninstall-plugins`
- improvements to `continous_cycle` dosing automation.
- hardware based PWM available on pins 1 & 3.