v3.15.0

=== Fixes ===
* Fixed ambiguous overload issue with `std::optional<T>` in C++26. (#3095)
  * Since `std::optional` was turned into a range, the partial specialization of `StringMaker` for range-like types and for `std::optional<T>` were in conflict.

=== Improvements ===
* Simplified `CATCH_REGISTER_ENUM` internals for faster compilation and retrieval.
* Successful assertion are slightly (1-2%) faster.
* Generic (new-style) matchers support constexpr matching in C++20.
  * Combining matchers requires C++26.
  * Catch2-provided generic matchers are all constexpr enabled.
* Added `STATIC_REQUIRE_THAT` for compile-time matcher assertions.
  * This requires the compiler to support enough `constexpr` for matchers, see above.
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