motion basics with MAXL-splines

...s/stepper-hbridge/firmware/dual-hbridge/COBSUSBSerial.cpp

...its/stepper-hbridge/firmware/dual-hbridge/COBSUSBSerial.h

...t/circuits/stepper-hbridge/firmware/dual-hbridge/cobs.cpp

...hit/circuits/stepper-hbridge/firmware/dual-hbridge/cobs.h

.../stepper-hbridge/firmware/dual-hbridge/fixedPointUtes.cpp

...ts/stepper-hbridge/firmware/dual-hbridge/fixedPointUtes.h

.../circuits/stepper-hbridge/firmware/dual-hbridge/lutgen.js

...epper-hbridge/firmware/dual-hbridge/serializationUtes.cpp

...stepper-hbridge/firmware/dual-hbridge/serializationUtes.h

.../stepper-hbridge/firmware/dual-hbridge/simple-hbridge.ino

...circuits/stepper-hbridge/firmware/maxl-stepper/.gitignore

...per-hbridge/firmware/maxl-stepper/.vscode/extensions.json

...epper-hbridge/firmware/maxl-stepper/.vscode/settings.json

...uits/stepper-hbridge/firmware/maxl-stepper/include/README

...circuits/stepper-hbridge/firmware/maxl-stepper/lib/README

...uits/stepper-hbridge/firmware/maxl-stepper/platformio.ini

...rcuits/stepper-hbridge/firmware/maxl-stepper/src/main.cpp

...ts/stepper-hbridge/firmware/maxl-stepper/src/maxl/fxp.cpp

...uits/stepper-hbridge/firmware/maxl-stepper/src/maxl/fxp.h

...s/stepper-hbridge/firmware/maxl-stepper/src/maxl/maxl.cpp