Paradox clone functionality implemented (#747)

This involves a refactor to the arm HID code to allow for arbitrary
preambles (such as HID Proximity and Paradox).
The client also borrows from the HID code, but is not shared, so could
use a significant refactor in the future.

client/hidcardformatutils.c

@@ -169,4 +169,4 @@ bool add_HID_header(/* inout */hidproxmessage_t* data){
     data->bot |= 1 << data->Length; // leading 1: start bit
   }
   return true;
-}
+}