MathPlot widget

Previously discussed here: https://github.com/SpartanJ/eepp/discussions/139 These are both based on GnuPlot: https://github.com/alandefreitas/matplotplusplus https://github.com/arminms/g3p But searching Github, I found another project: https://github.com/sebsjames/mathplot It's not based on GnuPlot as I know.