v2.6.0

**With this release the data generator feature is now fully supported.**

--- Improvements ---
* Added `TEMPLATE_PRODUCT_TEST_CASE` (#1454, #1468)
  * This allows you to easily test various type combinations, see documentation for details
* The error message for `&&` and `||` inside assertions has been improved (#1273, #1480)
* The error message for chained comparisons inside assertions has been improved (#1481)
* Added `StringMaker` specialization for `std::optional` (#1510)
* The generator interface has been redone once again (#1516)
  * It is no longer considered experimental and is fully supported
  * The new interface supports "Input" generators
  * The generator documentation has been fully updated
  * We also added 2 generator examples

--- Fixes ---
* Fixed `-Wredundant-move` on newer Clang (#1474)
* Removed unreachable mentions `std::current_exception`, `std::rethrow_exception` in no-exceptions mode (#1462)
  * This should fix compilation with IAR
* Fixed missing `<type_traits>` include (#1494)
* Fixed various static analysis warnings
  * Unrestored stream state in `XmlWriter` (#1489)
  * Potential division by zero in `estimateClockResolution` (#1490)
  * Uninitialized member in `RunContext` (#1491)
  * `SourceLineInfo` move ops are now marked `noexcept`
  * `CATCH_BREAK_INTO_DEBUGGER` is now always a function
* Fix double run of a test case if user asks for a specific section (#1394, #1492)
* ANSI colour code output now respects `-o` flag and writes to the file as well (#1502)
* Fixed detection of `std::variant` support for compilers other than Clang (#1511)

--- Contrib ---
* `ParseAndAddCatchTests` has learned how to use `DISABLED` CTest property (#1452)
* `ParseAndAddCatchTests` now works when there is a whitspace before the test name (#1493)

--- Miscellaneous ---
* We added new issue templates for reporting issues on GitHub
* `contributing.md` has been updated to reflect the current test status (#1484)
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