T55xx downlink Modes

Changes :
- Added t55xx downlink protocols (long leading reference, leading 0 and 1 of 4)
- Added function to all read to call differnet downlink functions (to match write)
- Update functions to support using differnet downlink modes.
- Added support for calling downlink modes for lf t55 read, write and detect
- Added new function lf t55 bruteforcedl to support downlink modes as well as try each mode
	for each password in password file.

for functions with downlink mode extenstion.

 e <mode>     - OPTIONAL downlink encoding '0' fixed-bit-length (default),
					   '1' Long Zero Reference,
					   '2' Leading Zero,
					   '3' 1 of 4