Add SPI slave support and basic example #1612
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Summary
This PR implements SPI slave mode.
References
This is a follow up for the ticket #1600.
Motivation
Most high level possible functions to implement this feature were used. In
order to be as close as possible to other Arduino examples.
SPIClass
functions have not been touched as much as possible.Validation
Example sketches for SPI master and slave are provided with this PR.