Introduces Equil, a thin storage class for 'EQUIL' derived information,
accessible through EclipseState.
Previously this was handled through "raw" deck access, provided by
EquilWrapper. The interface for Equil has been derived from the
EquilWrapper, but they're to be seen as different entities altogether.
More importantly, Equil is owned by EclipseState, not some stand-alone
Deck reading unit.
