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[12]_epsilon[cc|var]_[012]_[012]_[affine|blending].[ch]pp

files by newly generated single

   p[12]_epsilon[cc|var]_[affine|blending].[ch]pp

files. It also udpates

   p[12]_epsilon_all_forms.hpp

and changes the corresponding header inclusions in the operator
sources.
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