Currently the PCF8574 address selection detects the MCP230xx which is using an address in the range 0x20 - 0x26.
This fix skips the address defined in #define USE_MCP230xx_ADDR
* Change supported PCF8574 I2C address range to 0x20 - 0x26 allowing other I2C devices with address 0x27 to be used at the same time
* Change supported PCF8574A I2C address range to 0x39 - 0x3F allowing other I2C devices with address 0x38 to be used at the same time
* Change supported MCP230xx I2C address range to 0x20 - 0x26 allowing other I2C devices with address 0x27 to be used at the same time