v3.16.0

=== Fixes ===
* Multiple fixes in `catch_discover_tests`:
  * Fixed `<target>_TESTS` variable accumulating JSON fragments alongside test names.
    * This was introduced during the refactoring in last release.
  * Fixed `<target>_TESTS` variable from `catch_discover_tests` not escaping test names to be properly parsed by CMake.
    * This means that e.g. test names with semicolons will not be split into multiple partial test names.
    * This bug has existed since the first version of the script.
  * Fixed `TEST_PREFIX`/`TEST_SUFFIX` args having leading/trailing whitespace stripped.
* Added workaround for Clang 20-21 compile error with `TEMPLATE_PRODUCT_TEST_CASE` (#3115, #3173)

=== Improvements ===
* Verbosity option is now handled per reporter.
  * The standalone `--verbosity` flag is propagated to all reporters as default, just like `--colour-mode`.
* The JSON reporter considers verbosity when listing tests.
* Another set of performance improvements for `catch_discover_tests` performance
  * The newest version can register about 3k tests in 1 second, up from 1k previously.
* The initial `TEST_CASE` registration is slightly faster.
* Reduced overhead from first instantiating `BENCHMARK` machinery in a TU.
* Improved compilation speed when multiple templated test case macros use the same types.
* Rewrote implementation of the string matchers
  * Case-sensitive matching (the default) is significantly faster.
  * Case-insensitive matching is faster in most cases.
* Added optimizer barrier to calls into benchmarks without return values
  * This limits the optimizations compiler can perform **between calls** into the benchmarked function, improving the accuracy.
* Added warning that checks for using sharding without deterministic test order (#3186)
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