2019-06-07 0.3.0

Yaks all the way down

• Add ds18x20 lib
• Implement DS and HX sensors using AbstractSensor
• ds18x20: Add reading multiple sensors
• Populate SensorManager, add bus management, add OneWireBus
• SensorManager: Make ds18x20 use OneWire-Bus through AbstractBus
• ds18x20: fix runtime issues, resetting OneWire before scanning for devices
• Little cleanup
• SensorManager
  • Add bus driver for i2c and onewire busses
  • Settings: add busses to (sensor-)settings
  • Convention: Bus address <BUS_FAMILY>:<BUS_NUMBER>
• Makefile|libs:
  • Add bme280, Pycoproc, Quectel L76 GNSS library (Pytrack Board)
  • Add Pytrack Board Library, Pytrack Board Accelerator
• SensorManager
  • Add bus to sensor registry
  • Add bme280 (humidity, temperature, pressure)
  • Add i2c bus
  • Cleanups
• Compensate for missing _onewire package, maybe on older firmwares
• Move acquire_bus to AbstractSensor
• Fix I2C pin propagation
• Add Pytrack sensor
• Don't croak on failures
• Fix HX711 pin wiring
• Move Pytrack sensor to ratrack namespace
• Add Pytrack Quectel L76 GNSS sensor
• Makefile: cleanup (rm old DS18X20 lib)
• settings|sensor: add TODO: "i2c-address -> settings -> sensor"
• settings|sensor: add TODO: "i2c-address -> settings -> sensor"
• Sensors: naming, (WIP!) hardcoded proposal for naming (see bme280)
• Add Pytrack support
• Moar sensors
• Add appropriate logging
• Improve LoRa subsystem
• Improve logging, code cosmetics
• Add "make clean" target
• Enable all sensors
• Improve bus registration
• Improve BME280 readings
• Improve documentation
• Update documentation
• Add LoRaWAN/TTN telemetry with CayenneLPP
• Start WiFi before LoRaWAN
• Reduce logging noise
• Improve sandbox, documentation and naming things
• Update documentation
• Remove main.py.dist again
• Improve automatic sensor field naming
• Improve example settings
• Improve logging all over the place
• Upgrade to rshell 0.0.21
• Use “device_id” as part of the MQTT “client_id”
• Fix telemetry success signalling
• Cleanup
• Improve network/telemetry error handling, robustness
  and convenience for WiFi and MQTT connectivity
• Improve logging
• Update documentation
• Improve reporting about which telemetry targets succeeded