TMC5160: Added TMC5160 support
* Added example code for tmc5160 and smoke test
* Update go.mod
* Updated mod file
* Cleaned up commented out code and updated readme.
* ran go fmt
* Fixed setrampspeed func
* Removed spi1 pin setup in example.go. Renamed SPIComm to spicomm.go
* Removed unused test file
* Removed commented line