v2.12.3

--- Fixes
* `GENERATE` nested in a for loop no longer creates multiple generators (#1913)
* Fixed copy paste error breaking `TEMPLATE_TEST_CASE_SIG` for 6 or more arguments (#1954)
* Fixed potential UB when handling non-ASCII characters in CLI args (#1943)

--- Improvements
* There can be multiple calls to `GENERATE` on a single line
* Improved `fno-except` support for platforms that do not provide shims for exception-related std functions (#1950)
  * E.g. the Green Hills C++ compiler
* XmlReporter now also reports test-case-level statistics (#1958)
  * This is done via a new element, `OverallResultsCases`

--- Miscellaneous
* Added `.clang-format` file to the repo (#1182, #1920)
* Rewrote contributing docs
  * They should explain the different levels of testing and so on much better
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