move latex/mathjs converters to MathUtility class
move latex/mathjs converters to MathUtility class

stardust66/math3d,ChristopherChudzicki/math3d,stardust66/math3d,ChristopherChudzicki/math3d,stardust66/math3d,ChristopherChudzicki/math3d,ChristopherChudzicki/math3d,stardust66/math3d