implement "ExtrudedPolygon"

[tpmccauley]

An example from the xml file for 2026D88:

<ExtrudedPolygon name="hgcalwafer:HGCalEEEpoxyT0Finedm0"> 
<XYPoint x="64.495810000000005857*mm" y="58.857967419033720091*mm"/>
 <XYPoint x="-18.724589999999999179*mm" y="-85.283993607171296958*mm"/>
 <XYPoint x="0.000000000000000000*mm" y="-96.094640684136678033*mm"/>
 <XYPoint x="83.220399999999997931*mm" y="-48.047320342068339016*mm"/>
 <XYPoint x="83.220399999999997931*mm" y="48.047320342068339016*mm"/>
 <ZXYSection z="-0.032500000000000001*mm" x="0.000000000000000000*mm" y="0.000000000000000000*mm scale=1.000000000000000000*mm"/>
 <ZXYSection z="0.032500000000000001*mm" x="0.000000000000000000*mm" y="0.000000000000000000*mm scale=1.000000000000000000*mm"/>
</ExtrudedPolygon>

For some background see the ExtrudedPolygon shape in https://dd4hep.web.cern.ch/dd4hep/usermanuals/DD4hepManual/DD4hepManualch2.html#x3-290002.9

See the related issue SketchUpCMS/ddtoddl_cfg#2

[tpmccauley]

As part of the tests the ExtrudedPolygon geometry has been implemented:
https://root.cern.ch/root/html534/guides/users-guide/Geometry.html#shapes

(just the faces without extrusion for now)

[tpmccauley]