Add residual saturation in Sigmoid function
This MR add a residual saturation parameter S_r into the existing Sigmoid function.
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Feature description was added to the changelog -
Tests covering your feature were added? Yes, see the newly added Tests\MeshLib\TestSigmoidFunction.cpp -
Any new feature or behaviour change was documented? Yes, the description in MaterialLib\MPL\Utils\SigmoidFunction.h has been changed accordingly.