v3.9.0

=== Improvements ===
* **Added experimental opt-in support for thread safe assertions**
  * Read the documentation for full details
* **The default test run order has been changed to random**
* Passing assertions are significantly faster when the reporter does not ask for `assertionEnded` events on passing assertions.
  * This is the default behaviour of e.g. Console or Compact reporter
  * Simple `REQUIRE(true)` is 60% faster in Release and 80% faster in Debug build configuration
  * Simple `REQUIRE_NOTHROW` is 230% faster in Release and 430% faster in Debug build configuration
  * Simple `REQUIRE_THROWS` is ~3% faster in Release and 20% faster in Debug build configuration (throwing introduces enough overhead that the optimizations inside Catch2 are mostly irrelevant)
* Small (2-5%) improvement if the reporter asks for `assertionEnded` events for passing assertions.
* The exit code constants are part of the Session API. (#2955, #2976)
* Suppressed unsigned integer overflow checking in locations with intended overflow (#2965)
* Reporters flush output after writing metadata, e.g. rng seed (#2964)
* Added unreachable after `FAIL` and `SKIP` macros (#2941)
  * This allows the compiler to understand that the execution does not continue past the macro, and avoids warnings.
* Added fast path for `assertionStarting` event when no reporter requires it
  * For backwards compatibility, this fast path is opt-in
  * A reporter can opt in by changing its `ReporterPreferences::shouldReportAllAssertionStarts`
* Improved last seen source location tracking to be more precise
  * This is used when reporting unexpected exceptions from tests

=== Fixes ===
* Fixed formatting of tags with more than 100 tests in the default `--list-tags` output (#2963)
* Fixed Clang-Tidy's `readability-static-accessed-through-instance` in tests
* Fixed most of Clang-Tidy's `cppcoreguidelines-avoid-non-const-global-variables` (#2582)
* The lifetime of scoped messages now strictly obeys their scope (#1759, #2019, #2959)
  * Previously Catch2 would try to keep them around during unexpected exception, to provide helpful context.
  * The amount of surprises the irregularities caused was not worth the occasional utility provided.
* `TEMPLATE_TEST_CASE_SIG` can handle signatures consisting of only types (#2680, #2995)
* Moved `catch_test_run_info.hpp` up from `internal/` subfolder into the main one (#2972)

=== Miscellaneous ===
* pkg-config files are now generated at install time (#2979)
  * This fixes missing debug suffix in library names
  * This fixes install prefix mismatch between build config and actuall installation
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