Summary

Preparing Aviary for multi-fuel update.

• Re-visiting fuel variables and giving them clear names, streamlining where possible.
• Swapping the order of components after mission: now landing components go before post-mission
• Moved fuel summation & fuel constraint components into Energy subsystem post-mission. This will give us much easier control over fuel tracking in the future and de-clutters components "floating loose" in the AviaryProblem.

Backwards incompatibilities

Changed Variable Names

Aircraft.Fuel.TOTAL_CAPACITY -> Aircraft.Fuel.MAX_CAPACITY_MASS
Aircraft.Fuel.TOTAL_VOLUME -> Aircraft.Fuel.MAX_CAPACITY_VOLUME

Removed Variables

BURN_PER_PASSENGER_MILE (never used)

The below variables were used in an alternate wing fuel capacity equation that relied on a reference capacity plus a function of the delta between a reference and actual wing area. This is extremely convoluted and it is far easier to instead directly override the fuel capacity instead.
Aircraft.Fuel.WING_REFERENCE_AREA
Aircraft.Fuel.REF_CAPACITY -> Aircraft.Fuel.WING_REFERENCE_CAPACITY
Aircraft.Fuel.WING_REF_CAPACITY_TERM_A -> Aircraft.Fuel.WING_CAPACITY_TERM_EXPONENTIAL
Aircraft.Fuel.WING_REF_CAPACITY_TERM_B -> Aircraft.Fuel.WING_CAPACITY_TERM_LINEAR