Power shaving

• Improve documentation
• Improve voltage divider settings for reading the battery level
• Package the release bundle with the same directory layout as the sandbox
• Add foundation for having button events through ESP32 touch pads
• Add basic logging configuration settings to support turning off logging entirely
• Fix purging of sensible configuration keys
• Improve MAC address formatting when logging network status
• Try 11 dB attenuation for measuring vcc
• Disable heartbeat through RGB-LED, just blink twice on startup
• Turn off interrupts while powering down the HX711
• Improve inline documentation and logging
• Improve IRQ handling when reading the HX711
• Sleep for 80 microseconds after pulling HX711 clock pin PD_SCK to HIGH
• Improve bus- and sensor power-management. Add "power_on" signal.
• Explicitly turn off LTE modem before deep sleep
• Use 6dB attenuation factor again when reading the ADC for measuring VCC
• Conditionally turn off LTE modem
• WiFi STA: Get hold of auth mode and store into NVRAM to skip WiFi scan on each cycle
• WiFi STA: Erase auth mode from NVRAM if connection fails
• Refactor radio/networking subsystem
• Explicitly start and stop Terminal on UART0 based on configuration
• HX711: Hold clock pin "PD_SCK" in designated state through internal pull-up in the RTC-domain, even during deep sleep.
• HX711: Improve setup and initialization after power up
• Add watchdog and feed it