[Tasks] I've just realized that the repository can create any logger type specified.
[Aux] Reader/writer concept separation for `locked_ptr`.
[Bug] Oops, I've fucked up.
[Code Style] Tiny reordering.
[Thread Safety] Logger object's internal state is now thread-safe.
[Aux] Dead code elimination.
[Thread Safety] For wrapper.
[Unit Testing] Logger tracing is disabled by default.
[Aux] Renaming.
[Project] Moving `BLACKHOLE_HEADER_ONLY` declaration to the config file.
[Project] Disable tests and examples by default.
[Aux] Reordering.
[Bug Fix] Assign verbosity level.
[Version] Bumped.