Log Message:
catch2: update to 2.13.0.

## 2.13.0

### Improvements
* `GENERATE` can now follow a `SECTION` at the same level of nesting (#1938)
  * The `SECTION`(s) before the `GENERATE` will not be run multiple times, the \ 
following ones will.
* Added `-D`/`--min-duration` command line flag (#1910)
  * If a test takes longer to finish than the provided value, its name and \ 
duration will be printed.
  * This flag is overriden by setting `-d`/`--duration`.

### Fixes
* `TAPReporter` no longer skips successful assertions (#1983)

## 2.12.4

### Improvements
* Added support for MacOS on ARM (#1971)

## 2.12.3

### 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