Added TagState enum
Simplified format_tag_value
Added CardRace and Faction enums
Removed some of the reduncancy in enums.py
Make capture file format independent of endianness

Libnids is a bit strange in that it does convert source/destination port
to host byte order but not the source/destination address. So we have to
do it ourselves.
Added missing __init__.py
Added OptionType enum