use of NimBLE, to keep BLE and WiFi connected at the same time

[KlausMu]

Changes in this fork compared to https://github.com/lumokitho/

• NimBLE is used as bluetooth stack. With this, both WiFi and BLE can be active at the same time
• some smaller changes in the eQ3 library to improve stability (see here and here)
• in file main.cpp
  • WiFi is kept active
  • BLE connection to the keylock is kept active. Doing so, the keylock stays very responsive, but drains more battery
  • use of a hardware button connected to GPIO is commented out, because it constantly triggered if no button was connected to the GPIO
• Libraries "ArduinoJson", "AutoConnect", "PageBuilder", and "PubSubClient" are no longer saved as copies in folder "lib", but latest versions are retrieved from GitHub
• esp32 partition table partitions_ble.csv was removed (was no longer valid) and replaced with min_spiffs.csv (because of size of the firmware)

Please also see this discussion
#21

[wischbgr]

@KlausMu

Thanks for your work! I think you can retain OTA using board_build.partitions = min_spiffs.csv