Move Ualpha and Ubeta to FOCMotor #829

Job	Run time
lint	5s
Test compiling (arduino:avr:uno)	2m 44s
Test compiling (arduino:sam:arduino_due_x)	56s
Test compiling (arduino:avr:mega)	36s
Test compiling (arduino:avr:leonardo)	27s
Test compiling (arduino:samd:nano_33_iot)	1m 15s
Test compiling (adafruit:samd:adafruit_metro_m4)	2m 9s
Test compiling (esp32:esp32:esp32doit-devkit-v1)	4m 9s
Test compiling (esp32:esp32:esp32s2)	2m 52s
Test compiling (esp32:esp32:esp32s3)	4m 14s
Test compiling (STMicroelectronics:stm32:GenF1:pnum=BLUEPILL_F103C8)	4m 40s
Test compiling (STMicroelectronics:stm32:Nucleo_64:pnum=NUCLEO_F411RE)	8m 36s
Test compiling (STMicroelectronics:stm32:GenF4:pnum=GENERIC_F405RGTX)	3m 18s
Test compiling (STMicroelectronics:stm32:GenL4:pnum=GENERIC_L475RGTX)	9m 53s
Test compiling (STMicroelectronics:stm32:Disco:pnum=B_G431B_ESC1)	1m 13s
Test compiling (arduino:mbed_rp2040:pico)	1m 14s
	48m 21s

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