Change serial selection mechanism to allow for falling back #33
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If the macros for hardware serial aren't set, fall back to softserial. If any one of them are set, don't set the softserial macro and don't include the softserial lib.
This allows the user to set the macro to select the serial port within the sketch itself rather than having to edit the library itself. If the user does not do so, the library falls back onto software serial as a backup method.