WIP: Experimental replacement of typetree

Simon Praetoriusrequested to merge
feature/new-typetree into master

Summary

This is an experiment to replace the old structures in dune-typetree with a new type-tree implementation more similar to the TreeContainer, i.e., a composition of std::array, std::tuple and std::vector.

See also dune-typetree!111 (closed)

Edited by Simon Praetorius

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