fix property names for Part RegularPolygon and Prism

Prism properties: - Polygon, Circumradius and Height
RegularPolygon  : - Polygon and Circumradius

DraftTools updated to reflect the change in property names
Part_Prism in OpenSCAD,

update references to the properties of Part_Prism
in importCSG.py and prototype.py
fix error Part_Prism in OpenSCAD,

update references to the properties of Part_Prism
in exportCSG.py
Draft: Fixed regular polygon default name
Merge branch 'master' of ssh://git.code.sf.net/p/free-cad/code