PCF8574 Implementation

Have now implemented, but not tested support for the PCF8574 I2C GPIO extender. This supports 8 IOs, and nothing else - no fancy config, no PWM - it’s very bare bones. However, it’s very cheap - RS are sending me 5 for about 50p each, plus VAT. See here for the QFN20 breakout board required for prototyping.

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