Fixed hibernate / poweroff for BLE companions and repeaters to stay at uA

[IoTThinks]

Hi all,
This is another big PR to fix hibernate / poweroff for BLE companions and repeaters to stay at uA. E.g: Heltec v4 is at 13uA (not mA).
When hibernating / powerOff, the device with 3000 mAh should last months or even years.

Current situations in hibernating / poweroff:

• powerOff / enterDeepSleep are duplicated in many variants and not stay at uA. The boards are stay in 6-10mA or more.
• GPS: GPS is never off and consumes 10-20mA.
• BLE companions: BLE companions with GPS does not off GPS when hibernating.
• Repeaters: powerOff in NRF52 will stay at 6mA not work as "sd_power_system_off()" only works for devices with soft device (such as BLE).
• poweroff CLI in repeaters does not cut power for OLED, LoRa and GPS.
• Wakeup when there is LoRa packets: It should remain off even there are coming LoRa packets. In crowded areas, the devices will be waken up in 5s.

The proposed PR:

• Put powerOff() in NRF52Board and ESP32Board to turn off OLED, LoRa, GPS.
• Child variants can put in extra code and reuse the powerOff in NRF52Board and ESP32Board
• Remove wakeup by buttons for ESP32Board. No board uses it. You can click RESET button to power on the board again.

I have tested with common boards in our lab.
However, you are welcome to test the PR for your boards.

Have a great day.