matplotlib dependencies prevents from use in Rhino

[jf---]

the following import statement:

from compas_slicer.post_processing import generate_brim

seems to rely on matplotlib

Expected behavior matplotlib is tricky / impossible to install to on IronPython hence this dependency renders compas_slicer incompatible with Rhino moreover, since matplotlib is a pretty hefty package ( can depend on Qt5 in turn ) it takes a whopping ~10s to load

Desktop (please complete the following information):

• OS: osx 10.10, Rhino 6
• IronPython
• compas 1.21.1
• compas_slicer ( HEAD )

Screenshots