add support for PartialNonuniformLoad into TriangleElement. Add example to the documentation: https://github.com/BriefFiniteElementNet/BFE.Net.devdocs/blob/master/docs/loads/elementLoads/partialnonuniformload.rst#id1
add support for PartialNonuniformLoad into TriangleElement.
Add example to the documentation:
https://github.com/BriefFiniteElementNet/BFE.Net.devdocs/blob/master/docs/loads/elementLoads/partialnonuniformload.rst#id1