Changing the openmqttgateway pinout !

By adding more and more modules to the gateway free pins begins to be difficult to find.
The classic wiring used since the begining doesn't answer to the need of adding i2c or rfm69. Rfm69 for instance use fixed pins already used by other component.

Due to these issues we had to redesign a new wiring.

There is no anymore classic, I2C or RFM69 wiring selection in configuration. We now have only one wiring with RF, IR, I2C, ADC, HCSR501 and BT gateway. If you want to add RFM69 and DHT you need to remove I2C , BT and HCSR501.

These 2 configurations are described here.

Of course you can adapt these configurations to suits your needs, they are not a fixed base.
They are only suggestions corresponding to the wiki schematic and config pins

Thanks for the big work of @hannesdi on the wiki/tests and the suggestion of using RX pin from @gammelobst.

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