Temperature as a function of velocity curves

Includes configs setting up atmospheres for Kerbin / Earth, Eve / Venus, Duna / Mars, and Jool / Jupiter. Default configs for gas giant, rocky oxygen-poor and rocky oxygen-rich atmospheres, determined in code from CelestialBody data.

Set up to handle these gas species:
H2, He, N2, O2, CO2, H, C, N, O, CO and some ionization states; further species can be added in the configs as needed.

All curves require definition of mass fractions of the constituent gases in the atmosphere, a reference temperature to calculate the curve in Kelvin, (commonly 273 K), and a maximum velocity to stop the simulation at (often something absurd).