Add transactional traits for SPI and I2C#178

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ryankurte wants to merge 15 commits into

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ryankurte:feature/spi-i2c-transactions

Commits on Jan 9, 2020

Commits on Jan 10, 2020

Commits on Jan 21, 2020

Commits on Jan 27, 2020

Commits on Feb 27, 2020

swap to single buffer for blocking::spi::Operation::WriteRead
ryankurte
committed

Commits on Mar 4, 2020

moved blocking::spi::Transactional to operation slice to allow generic traits
ryankurte
committed

Commits on Mar 9, 2020

removed generic bound from blocking::spi::Transactional
ryankurte
committed