Used IntelliJ IDEA's linter to perform code cleanup.
There were unused variables, `var` that could be replaced with `val`,
and other minor code style issues.
While doing this, I also discovered that a lot of documentation
links were broken. The fix is to stop intenting the text after
a `@param`.
When documentation refers to a Body value, e.g. Body.Earth,
link to its information page. I'm not sure this is super helpful,
but it is an attempt to provide better linking.
Added more explanatory text about the SSB and EMB values.
I found that a blank line splits the extra text onto the
dedicated pages for SSB and EMB, while leaving the "brief"
description on the list of all Body enum values. That is nice.
I found that there were a bunch of lingering 'jvm'
tags in the generated markdown documentation.
Got rid of them with another change to format_kotlin_doc.py.
The dokkaGfm tool has a few oddities I don't like.
I updated my format_kotlin_doc.py script to work around
a couple of them:
1. Strip out all the noisy [jvm] tags it puts everywhere.
2. Remove the unhelpful and incorrect `Properties` sections
it adds to all my enum classes and enum members.
I will come back and address other issues later.
Added geoEmbState: calculates the geocentric
state vector of the Earth/Moon Barycenter (EMB).
Added baryState: calculates the barycentric
state vector of a body.
Unit tests now support parsing JPL Horizons
state vector text files.
