Add Stepper motor driver #151

Job	Run time
Check that stm32 generated code is up to date	37s
Unit Test UF2 (ubuntu-latest)	16s
Unit Test UF2 (windows-latest)	1m 26s
Build (ubuntu-latest)	30s
Unit Test UF2 (macos-latest)	25s
Build (windows-latest)	1m 0s
Build Examples (espressif/esp)	2m 15s
Build (macos-latest)	23s
Build Examples (gigadevice/gd32)	2m 8s
Build Examples (microchip/avr)	2m 7s
Build Website	20s
Build Examples (microchip/atsam)	1m 57s
Dry Run Packaging	1m 9s
Build Examples (nordic/nrf5x)	1m 57s
Build Examples (nxp/lpc)	1m 57s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	16s
Unit Test Regz (ubuntu-latest)	26s
Build Examples (stmicro/stm32)	17s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	33s
Unit Test Regz (windows-latest)	1m 8s
Build Examples (raspberrypi/rp2xxx)	2m 19s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	22s
Unit Test Regz (macos-latest)	25s
Build Examples (wch/ch32v)	2m 18s
Unit Test Ports (windows-latest, gigadevice/gd32)	1m 54s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	1m 14s
Unit Test Ports (windows-latest, stmicro/stm32)	1m 16s
Unit Test Ports (macos-latest, gigadevice/gd32)	22s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	27s
Unit Test Ports (macos-latest, stmicro/stm32)	24s
	32m 8s

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