Remove transition code for old ReferenceElement and returning references

Christoph Grüningerrequested to merge
feature/cleanup-reference-element into master
  • Remove code from Transitional::ReferenceElement that supported the old (pre-2.6) ReferenceElement
  • Deprecate Transitional::ReferenceElement
  • ReferenceElement methods returning references now return values
Edited by Christoph Grüninger

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