Refactor internal functions to be defined outside of plot functions

[the-mayer]

          Tagging functions for future review. 

The following internal functions should be defined outside of the plotting functions that currently use them. This way, the plot functions can reference these external functions, avoiding the need to define functions within functions.

• .LevelReduction()
• .GetKingdom()

Originally posted by @the-mayer in #63 (comment)

[teddyCodex]

taking a crack at this @the-mayer

[Joiejoie1]

@teddyCodex are you working on this or can I give it a shot as well?

[teddyCodex]

Hi @Joiejoie1 Already raised a PR
Waiting on @the-mayer to review.