0028273: Inefficient implementation of the BRepOffset_MakeOffset::BuildSplitsOfFace...

0028273: Inefficient implementation of the BRepOffset_MakeOffset::BuildSplitsOfFace function

The method for building splits of the face BRepOffset_MakeOffset::BuildSplitsOfFace has been redesigned to use the BOPAlgo_BuilderFace algorithm directly.
The methods FindInvalidFaces and TrimNewIntersectionEdges have been corrected to avoid possible instabilities.
The filtering of invalid edges by existing bounding edges has been corrected to avoid removal of valid splits.
The method BRepOffset_Analyse::Correct2dPoint has been modified to avoid unnecessary initialization of BRepAdaptor_Surface.

Adjustment of the test cases.
Test case bugs modalg_6 bug26513 has been modified to unify faces of the input shape before operation.