mpeg2_ts.cpp: Change mpeg2_ts to mpeg2_ts_tpl
protocol_helper.hpp:  Added a protocol class for retrieving and setting fields

* Currently, this only supports getting a field value.
example/mpeg2_ts.cpp:  Use the new protocol class
Fix get_field with 1 bit and 8 bit fields:

* Note that this may still be broken.
Print out all the mpeg 2 ts fields