Allow caller to choose transmit and receive pins #3
I've got my transmitter connected to different pins than those in the library due to other constraints, so this adds an overload of
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* Add an overload of lw_setup so that the caller can optionally specify which pins should be used for transmitting and receiving messages (and which interrupt to attach). * Split setup into lw_tx_setup and lw_rx_setup so that these can be called individually for projects only using transmit or receive to reduce the compiled code size.