Update Dynamic variable hierarchy with better sub-level names

[jkirk5]

Desired capability or behavior.

Dynamic currently has one "sub-level", Mission, which doesn't helpfully describe or break up the variables in Dynamic. I suggest updating the second layer of the hierarchy to be more descriptive. Possible refactored subclasses could include:

• atmosphere: values related to freestream and atmospheric conditions, such as altitude, density, Mach, etc.
• vehicle: values related to the vehicle, things the vehicle passes to the EOMs, such as total thrust, lift, mass, etc. - maybe flight path angle & AOA?
• engine: per-engine model values such as throttle, thrust, fuel flow, RPM, etc. Could be added as a third layer under vehicle for better clarity

Is your feature request related to a problem? Please describe.

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Associated Bug Report

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