1. Avoiding loading cats. It will we loaded later anyway but
   `catchNonFatal` is not worth it anyway
2. Avoid copying when reading all bytes from a file to compute digest of
   all files

Turned out that one needs to separate definition site of the serializer
from usage so that macros can do the magic properly.

When having nested option string values, decoders and encoders don't
seem to match under certain conditions. Added an option to skip the
values instead, which appears to remedy the problems.

Moving projects around to properly setup macros.