Add Stepper motor driver #143

Job	Run time
Check that stm32 generated code is up to date	46s
Build Website	28s
Build (ubuntu-latest)	26s
Build (windows-latest)	1m 11s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	18s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	28s
Unit Test Regz (ubuntu-latest)	19s
Build Examples (espressif/esp)	2m 15s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	26s
Build (macos-latest)	35s
Unit Test Regz (windows-latest)	1m 53s
Build Examples (gigadevice/gd32)	2m 9s
Unit Test Ports (windows-latest, gigadevice/gd32)	1m 0s
Unit Test Regz (macos-latest)	37s
Build Examples (microchip/avr)	2m 12s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	1m 31s
Unit Test Ports (windows-latest, stmicro/stm32)	47s
Build Examples (microchip/atsam)	1m 57s
Unit Test Ports (macos-latest, gigadevice/gd32)	48s
Unit Test UF2 (ubuntu-latest)	16s
Build Examples (nordic/nrf5x)	2m 6s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	45s
Unit Test UF2 (windows-latest)	1m 20s
Unit Test Ports (macos-latest, stmicro/stm32)	26s
Build Examples (nxp/lpc)	1m 55s
Unit Test UF2 (macos-latest)	24s
Build Examples (stmicro/stm32)	20s
Dry Run Packaging	2m 1s
Build Examples (raspberrypi/rp2xxx)	2m 29s
Build Examples (wch/ch32v)	2m 14s
	34m 22s

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