* 2954: Add test case
* Eliminate extra-test and merge it into existing std-test instead. Add conditionals for filesystem::path testing that does not run into the ambiguity problem.
* #2968: Introduce additional compile-time predicate to detect recursive ranges and reject them in formatter specialization for ranges. In addition, introduce additional wrapper traits for the individual logical operands of the complete range constraints
* #2968: Eliminate preprocessor condition that enables the formatter specialization for std::filesystem::path
* #2968: Eliminate preprocessor condition that enables the test for the formatter specialization for std::filesystem::path
* Use own bool_constant, which is available for all C++ versions
* Reintroduce previous workaround but restrict to VS 2015 for now
* Comma fix
* - Rename is_not_recursive_range to is_nonrecursive_range and add comment that explains it being depending on is_range being true
- Merge has_fallback_formatter_delayed into is_formattable_delayed and add comment that explains it being depending on is_not_recursive_range being true
- Replace disjunction in formatter specialization by has_fallback_formatter_delayed
- Get rid of unneeded detail:: prefixes within namespace detail
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