1. Translate the maneuver_simulator_GVE_IO that I wrote into python from its shitty matlabness
2. Use table 6.5 in my thesis to source all the propagator force models
3. spacecraft class should have config as one of its attributes
   1. same with Propagator class and config
4. Use page 74+ in Vallado for more timing stuff!! (Section 1.6)
5. okay so:
   1. spacecraft itself is just an entity, knows its own state and epoch
   2. propagator class should take state info from spacecraft, do propagation stuff, and then update the spacecraft state… it just gets info, props according to config, and spits out the result(s… data fam)