FindLineSegmentIntersection() was refactored in 2012 but there are a few uses that didn't get updated. This finalizes the cleanup Fixes https://gitlab.com/kicad/code/kicad/issues/7365
* Split up the thirdparty code into the thirdparty folder (#3637) * Create a new kimath static library containing all the math functions This is part of cleaning the build system for #1906.