Apply clang tidy, use -Werror on CI

See merge request !92

[clang-tidy] apply misc-redundant-expression, misc-static-assert, misc-unused-alias-decls, misc-unused-parameters, misc-unused-using-decls

modernize-avoid-bind, modernize-avoid-c-arrays, modernize-concat-nested-namespaces, modernize-deprecated-headers, modernize-deprecated-ios-base-aliases, modernize-loop-convert, modernize-make-shared, modernize-make-unique, modernize-pass-by-value, modernize-raw-string-literal, modernize-redundant-void-arg, modernize-replace-auto-ptr, modernize-replace-disallow-copy-and-assign-macro, modernize-replace-random-shuffle, modernize-return-braced-init-list, modernize-shrink-to-fit, modernize-unary-static-assert, modernize-use-auto, modernize-use-bool-literals, modernize-use-default-member-init, modernize-use-emplace, modernize-use-equals-default, modernize-use-equals-delete, modernize-use-nullptr, modernize-use-transparent-functors, modernize-use-uncaught-exceptions

Together with the already applied modernize-use-override we now applied all modernize checks except for modernize-use-nodiscard, modernize-use-noexcept and modernize-use-trailing-return-type

Enable cmake-lint pre-commit hook

See merge request !90

Update to DUNE 2.8

See merge request !75

Update LICENSE

See merge request !91

python bindings for dd glued and CouplingGridView

See merge request !52