* Proper coordinate rounding, as in Arond()
* Forgotten EOL now consumed if found (still optional)
* Convert unit tests images to 1-bit before comparing
* Much better unit testing script
* Add 17 test scripts from the 2019 TI-Planet and Planète Casio contest
which consisted in reproducing an image with minimum code
* Fix angle units for reverse trigonometric functions
* Add a streaming option to capture the output in real-time as a series
of bitmap images
* Switch to Decimal due to the non-continuity of Ent() breaking
assumptions about the fidelity of floats. Trigonometry functions are
still computed as floats.
* Fix the line rendering algorithm for edge cases and add a new test
line-positive.txt that ensures basic patterns are all correct.
* Use custom rules to generate text representation of decimal numbers as
to better match the output of the fx-92.
* Improve the test constants.txt to better evaluate this representation.
The interpreter automatically checks that the representation matches
the value and fails on error to avoid scratching heads.
* Fix EQUAL not being treated as a relational symbol.