[Housekeeping] Rework documentation on some files

[azurerazor]

• PST (we also might wanna remove laziness? idk)
• PQ Updates (not really underdocumented just harder to parse than I'd like)
• Polygon Center
• Halfplane Intersection (which way do the halfplanes point?)
• Extreme Vertex
• Minkowski Sum
• KD Tree
• General Matching
• Euler Walk (I believe the docu is for the kactl version but the code changed, might be wrong)
• Centroid Decomp
• Integrate Adaptive
• Runge Kutta
• Jacobian Matrix
• Newton's Method
• Eertree