[INDICATORS] Neopixel 2leds (#1596)

* Add Adafruit NeoPixel library #defines

* Currently FastLED causes rapid reboots on ESP32C3 boards when OMG signals.
  Onboard RGB LEDs can be adressed more reliably with the NeoPixel library.
  Define RGB_INDICATORS=2 to use this addition.
* rebase fix: adapt to "Bump ESP32" changes in development

* Add build environments for the Espressiv ESP32-C3-DevKitC-02 board

* esp32c3-dev-c2-ble and esp32c3-dev-c2-ble-no-serial environments both
  use the Adafruit NeoPixel library for the onboard RGB LED as FastLED
  causes rapid reboots.

* Only occasional reboots of this board occure when serial output is not
  read. The -no-serial version further improves stability.

* Add a build environment for the Espressiv ESP32-C3-DevKitC-02 board

* The esp32c3-dev-c2-ble offers a reasonable compromise between logging
  and stability of OMG on this board.

platformio.ini

@@ -98,6 +98,7 @@ extra_configs =
 ;default_envs = esp32s3-dev-c1-ble
 ;default_envs = esp32c3-dev-m1-ble
 ;default_envs = airm2m_core_esp32c3
+;default_envs = esp32c3-dev-c2-ble
 ;default_envs = lolin_c3_mini
 ;default_envs = thingpulse-espgateway
 ;default_envs = thingpulse-espgateway-ethernet
@@ -138,6 +139,7 @@ ethernet = Ethernet
 esp8266_mdns = esp8266_mdns
 wire = Wire
 fastled = fastled/FastLED@3.5.0
+adafruit_neopixel = adafruit/Adafruit NeoPixel@^1.11.0
 onewire = paulstoffregen/OneWire@2.3.7
 dallastemperature = DallasTemperature
 m5stickc = M5StickC@0.2.0