meshplotlib needs restructuring regarding the API
There has to be a cleaner way to:
- create a new plot
- plot on preexisting matplotlib objects
- plot multiple meshes
- plot multiple properties
- combination of both ( -> comparison matrix)
- plot / plot_limit / plot_diff should maybe be merged, otherwise, if we move some of the setup options to the functions arguments, then all the plot functions would need them -> code duplication
- reuse / combine / extend with pybinded c++ functionality from vtkdiff / xdmfdiff