Resolve outstanding TODO items in tudat-space

[larshinueber]

This is a collection of TODO notes on the docs.tudat.space website.
They should either be fixed directly (in case of a minor task), tracked in a separate issue for major tasks or removed if no longer relevant.

Using source

• • Video showcasing IDE usage
• • C++ example applications to compare to Python

Observation model setup

• • List of available biases
• • Example how to "manually" simulate observations by extracting an ObservationModel

Observation simulation

• • List of available observation dependent variables

Loading real data

• • Interface between Tudat and NSDC astrometry

Environment setup

• • Using the environment outside a numerical propagation

Available state definitions

• • "(TODO: link to propagation)"
• • "TODO: introduce element index enums"
• • Discussion on root finders
• • Link to rotational state propagation
• • Two types of quarternions "TODO-Dominic"
• • Introduce TEME frame

Environment architecture

• • Figure on environment architecture
• • Interdependencies of environment models

Aerodynamics

• • Implementation of control surfaces in Tudat

Available acceleration models

• • Change radiation pressure to single acceleration model

Thrust models

• • Thrust torque implementation (currently not implemented?)
• • Thrust and aerodynamics