Standardize BSpline Evaluation Tests

[kenneth-meyer]

Create .txt files to generate tests to compare C++ Bspline evaluations against existing Python BSpline evaluations. Goal: read in file using C++ and Python codes and compare the outputs.

Some problems:

• the evaluator doesn't correspond well with the input parser's format right now (see todo)

TODOs:

• refactor bspline evaluator to use a base class to avoid requirement of knowing dimension at compile-time @JohnEdwardJennings
• create a Python test script that calls bspline basis eval functions from src.bspline_src and saves evaluated curve/surface/volume to a file @TinkeringWithUS