Add support for a hardware bind plug (PB5 pin 41) and alternative

default settings for AlienWii32 (8 brushed ESC) based on the NAZE
target.
The goal for this switch is to be able to bind an RX without having CLI access. With your latest changes in the bind code the mcfg.spektrum_sat_bind parameter get deleted after a single use. The presence of the hardware can only be detected if the pin is short so there is no way to avoid the deletion of the mcfg.spektrum_sat_bind parameter which is needed during the bind process.  The initial idea for CLI variable was to make it configurable between two more actually unused pins in a second phase if this feature will be interesting for other future hardware. If you can recommend a different solution I can do so. BTW to make this available in a separate target only will create some more #ifdef’s.