4.0.0 Broadband simulations

Major version update, introducing broadband simulations.
plotVolumetric is replaced with the new, improved, more flexible and generalized "NdimSliderPlot.m" (N-dimensional slider plotter).
Introduced log plot checkbox to some plots that previously did not have that option.
mediaProperties is now an array of objects. All media properties are internally function handles.
Deprecated the power yield property, now only quantum yield is accepted.
Deprecated Tinitial, the initial temperature should now be specified in T, which serves as both input and output property.
Fixed issue with voxelization by switching to forked "mesh_voxelization" by William Warriner.
Many other various code changes and a few other bug fixes.