Path Bool library code cleanup (#2000)

* Remove log statements

* Add feature gates to functions in path.rs

* Fix infinite parsing loop and add new test

* License tweaks

* Remove trailing zero in whole number floats

* Flatten visual-tests directory

* Code review

* Clean up printlines

* Add error handling to path parsing

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

libraries/path-bool/visual-tests/establish-ground-truth.sh

@@ -0,0 +1,5 @@
+for dir in */; do
+	for fn in difference division exclusion fracture intersection union; do
+		cp "${dir}test-results/$fn-ours.svg" "$dir$fn.svg"
+	done
+done