change how reg ids are specified - just use constexpr and not enums, … #4

Job	Run time
compile-sketch (esp32:esp32:esp32c3, esp32:esp32, https://raw.githubusercontent.com/espressif/ard...	1m 5s
compile-sketch (SparkFun:apollo3:sfe_artemis_atp, SparkFun:apollo3, https://raw.githubusercontent...	1m 7s
compile-sketch (arduino:avr:mega, arduino:avr, https://downloads.arduino.cc/packages/package_inde...	19s
compile-sketch (esp32:esp32:esp32, esp32:esp32, https://raw.githubusercontent.com/espressif/ardui...	1m 8s
compile-sketch (arduino:samd:mkr1000, arduino:samd, https://downloads.arduino.cc/packages/package...	36s
compile-sketch (esp32:esp32:esp32s2, esp32:esp32, https://raw.githubusercontent.com/espressif/ard...	1m 17s
compile-sketch (arduino:mbed:nano33ble, arduino:mbed, https://downloads.arduino.cc/packages/packa...	46s
compile-sketch (rp2040:rp2040:sparkfun_promicrorp2040, rp2040:rp2040, https://github.com/earlephi...	34s
compile-sketch (esp8266:esp8266:thingdev, esp8266:esp8266, https://arduino.esp8266.com/stable/pac...	28s
compile-sketch (STMicroelectronics:stm32:GenF4, STMicroelectronics:stm32, https://github.com/stm3...	59s
compile-sketch (rp2040:rp2040:sparkfun_promicrorp2350, rp2040:rp2040, https://github.com/earlephi...	34s
	8m 53s

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