Add nonlinear stress potential modified von Mises properties to isotropic material attribute
| InitialTension | VariationAttr or double | Initial tensile yield stress | 
| InitialCompression | VariationAttr or double | Initial compressive yield stress | 
| HeatFraction | VariationAttr or double | Heat fraction coefficient | 
| temperature | double | unused | 
| Return value | Pointer to this object | Allows multiple function calls to be chained together | 
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