CHG: all @marshmellow42 's changes to make the reveng work.

ADD: lua script test for using the reveng inside lua.  *prove of concept*
      it implements -h help
                    -d  data in a hexstring
                    -w  width of the crc family. (ie 16 gives all CRC-16 calculations.
     it iterates thru all found crc presets in a crc family based on the width of crc.  It calcs crc and the reverse crc.

client/util.c

@@ -248,7 +248,7 @@ char param_getchar(const char *line, int paramnum)
 
 uint8_t param_get8(const char *line, int paramnum)
 {
-	return param_get8ex(line, paramnum, 10, 0);
+	return param_get8ex(line, paramnum, 0, 10);
 }
 
 /**