- update to 5.2.1:
* Clean a build environment and installed library dependencies using a new
cleanall target
* Override a default library builder via a new builder field in a build group
of library.json manifest
* Updated Cppcheck v2.6 with new checks, increased reliability of advanced
addons (MISRA/CERT) and various improvements
* Handle the "test" folder as a part of CLion project
* Improved handling of a library root based on "Conan" or "CMake" build systems
* Fixed a "KeyError: Invalid board option 'build.cpu'" when using a
precompiled library with a board that does not have a CPU field in the
manifest
* Fixed a "FileExist" error when the platformio ci command is used in pair
with the --keep-build-dir option (issue #4011)
* Fixed an issue with draft values of C++ language standards that broke
static analysis via Cppcheck