[invader] Document all tag definition changes in each release of Halo: Combat Evolved

[Aerocatia]

Invader currently supports three instances of Halo; The Xbox version, Halo PC/Custom Edition, and MCC CEA.
With each of these releases more things have been added to the tag structs. These should be documented both so it is known what was added to each engine release, and so we can error/warn if trying to use these features when targeting older engines.