Withdrawn changes from #2858 as they break ABI compat #2899
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Changes in the logger.h file and changes following this one have been blocked.
These changes break ABI compatibility. Parts of the changes and dependent parties are in the header files in the form of inline functions, which are considered static part of the library and will get incompatible with the parallel changes in the shared library.
Other changes from #2858 remain, and some that interfere with the restored old version have been blocked.
All these changes will be restored in 1.6.0, for which it is allowed to break ABI compatibility.