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Removed the legacy FMUv4 define that was activating a nonexistent pull up and on some HW driving the PPM_IN aka RC_IN aka SPEKTRUM_RX to VDD. Also detailed the connections of this pins for the board. The simplest connection is RC_IN to a timer capture pin and a UART. In this case the UART_RX pin and just be left as is. While the pin can be configured as the PPM_IN (Timer capture) or as SPEKTRUM_RX_AS_GPIO_OUTPUT to use it as and GPIO to Renamed the macros and defines to be more explicit as to what Is being done and the sense of the parameters