Investigate using a proper JINJA evaluation engine

[schuylermartin45]

The PR for Issue #186 (and arguably issue #166 as well) highlighted the need for more complex JINJA support.

At this current time, "complex" JINJA statements are evaluated through regular expressions. This was a hack/cost-cutting measure early in the project when I only knew about | lower and | upper-type functions.

We have since seen the need to support more complex JINJA statements. It is time to investigate a more permanent solution.

[schuylermartin45]

This is what we would likely use: https://github.com/AnacondaRecipes/jinja2-feedstock/blob/master/recipe/meta.yaml

Documentation available here: https://jinja.palletsprojects.com/en/stable/