Added check to Vector3D::angle(), to catch NaN error that could occur where two vectors are very close, and their dot product is outside the range that acos() function can handle
Added check to Vector3D::angle(), to catch NaN error that could occur where two vectors are very close, and their dot product is outside the range that acos() function can handle

TommyKaneko/Sketchup-API-C-Wrapper,TommyKaneko/Sketchup-API-C-Wrapper