Updates HyTeG forms for epsilon operator variants
The hyteg-form-generator now allows to generate single [ch]pp files for forms that are composed of different scalar sub-forms. This commit replaces the separate p_epsilon[cc|var]___[affine|blending].[ch]pp files by newly generated single p_epsilon[cc|var]_[affine|blending].[ch]pp files. It also udpates p_epsilon_all_forms.hpp and changes the corresponding header inclusions in the operator sources.
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