Add Stepper motor driver #165

Job	Run time
Check that stm32 generated code is up to date	44s
Build Website	19s
Build (ubuntu-latest)	24s
Build Examples (espressif/esp)	2m 14s
Build (windows-latest)	1m 27s
Dry Run Packaging	1m 13s
Build Examples (gigadevice/gd32)	2m 14s
Build (macos-latest)	25s
Build Examples (microchip/avr)	2m 9s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	22s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	28s
Build Examples (microchip/atsam)	1m 57s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	26s
Unit Test Regz (ubuntu-latest)	18s
Unit Test UF2 (ubuntu-latest)	16s
Build Examples (nordic/nrf5x)	1m 57s
Unit Test Ports (windows-latest, gigadevice/gd32)	56s
Unit Test Regz (windows-latest)	1m 30s
Unit Test UF2 (windows-latest)	1m 25s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	52s
Unit Test Regz (macos-latest)	28s
Unit Test UF2 (macos-latest)	29s
Unit Test Ports (windows-latest, stmicro/stm32)	1m 23s
Build Examples (nxp/lpc)	2m 1s
Unit Test Ports (macos-latest, gigadevice/gd32)	25s
Build Examples (stmicro/stm32)	18s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	21s
Build Examples (raspberrypi/rp2xxx)	2m 21s
Unit Test Ports (macos-latest, stmicro/stm32)	23s
Build Examples (wch/ch32v)	2m 11s
	31m 56s

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