MathGL Code

Try minor optimization OMP

Minor improve in 'mode'

Compatibility changes with Qt6

Improve in 'mode' functions

Add 'mode' to find the mode of 1D or 2D waveguide

Fixes for recent changes in Qt5; Start to add 'mode' for determioning 1d or 2d wave-guide mode (not finished)

Bugfix for wrong position of left edge of 'bbox'

Bugfix for using dashing in hex color with 'd'

Add HistL() for histogram by linear interpolation; Add operators for mglDataC; Start adding multi-fontface features (not finished)

Update fonts and set STIX2 (STIXTwo) font as default. Add CJK fonts. Note, changes are not well tested -- you can use old STIX in the case of any problems