Remove code bloat and improve hygiene

[fjebaker]

The project is a little over a year old now and the code bloat is apparent.

Need to go through each function with a fine toothed comb and see what can be made leaner, or even just removed entirely. Also there are a number of bad habits that should be corrected, such as

• remove always using where {T} unless actually needed
• anonymous lambda functions are difficult to debug, give them names
• function names and extraction API, e.g. getgeodesicpoint vs just process, as that is what it's really doing.
• Keyword arguments passed to solver in orbit finder #16

Also worth looking into

• Custom solution type #13
• GPU support #8 : not worth it as it currently stands

before getting too carried away with more features.