* moved more code into `HAVE_RULES`
* properly enable all internal and rules code in selfcheck
* updated TODOs in selfcheck
* testrunner.vcxproj.filters: updated
* added missing `Debug-PCRE` and `Release-PCRE` configurations for `testrunner` Visual Studio project
* cppcheck.cpp: fixed `useStlAlgorithm` selfcheck warning
* SingleExecutor: added TODOs
* test `SingleExecutor` with files and project
* SingleExecutor: process markup files after code when scanning project
* TestSingleExecutor: generate scoped files before calling executor
* CI-unixish.yml: added `--output-on-failure` to CTest call
* helpers.cpp: improved error reporting in `~ScopedFile()`
* use unique filenames in executor tests to avoid collisions
* fixed `functionStatic` selfcheck warnings
* added CMake option `DISABLE_DMAKE` to disable `run-dmake` dependencies
* tools/CMakeLists.txt: added TODO
* use `ccache` for sanitizer builds
* aligned selfcheck between sanitizer workflows and disabled some currently unnecessary steps
* CI-unixish.yml: do not use precompiled headers with `ccache`
* Makefile: bail out if `pcre-config` is missing
* CI-unixish.yml: install `pcre` for `macos` via `brew` since it suddenly disappeared from the runner images
* CI-unixish.yml: handle precompiled headers with `ccache`
* actually support `ccache` in CMake < 3.17
* CI-unixish-docker.yml: split CMake build and test execution into separate steps
* findDependencies.cmake: only print message about macthcompiler being disabled when it is actually used
* CI-unixish-docker.yml: added missing `ccache` CMake options
* cleaned up triage.pro and pass all triage files to selfcheck
* CI-unixish.yml: factored out redundant selfcheck flags
* CI-unixish.yml: cleaned up selfcheck suppressions and fixed warnings
* added explicit `missingInclude` checks to selfcheck to work around current issues/limitations / fixed selfcheck includes / added some unit tests for `missingInclude`
* applied the selfcheck changes to the sanitizer jobs
* only fail TSAN CI build in case of TSAN error / updated sanitizer CI build TODOs
* lib/CMakeLists.txt: removed unnecessary external include
* look up tinyxml2 include dir when using system one and specify it
* lib/CMakeLists.txt: do not treat bundled headers as system ones
* CI-unixish.yml: actually perform system tinyxml2 build on macos
* modernized some CMake invocations
* CI-unixish.yml: use `ccache` for Linux gcc CMake builds
* CI-unixish-docker.yml: use `ccache` for Linux gcc CMake builds
* CI-unixish-docker.yml: enabled CMake build with tests for more images
* CI-unixish-docker.yml: adjusted some step checks
* runtests.sh: added strict mode - enabled via `STRICT=1`
* CI-unixish.yml: added strict cfg check
* runtests.sh: disabled syntax check for kde.cpp since `kde-4config` is no longer commonly available in recent distros
* runtests.sh: disabled syntax check for opencv2.cpp since `opencv.pc` is not commonly available in distros
* runtests.sh: added missing trailing slash to `CFG` - fixes define checks
Oliver Stöneberg
Daniel Marjamäki