Remove overly verbose messages from loguru.

Closed Nick Thompson requested to merge (removed):loguru_verbosity_reduction into master

Before this commit, a ctest -V generates 1.3 million characters. After this, it generates ~800,000. The information presented by loguru is either already spat out by ctest, or not very informative, such as atexit, or a bunch of --------.

I checked to see if I could change the loglevel and do this without changing loguru, but failed.

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