Common/Log: Add basic fmt-capable functions to the interface.

Provides a basic extension to the interface to begin migration off of
the printf-based logging system.

Everything will go through macros with the same style naming as the old
logging system, except the macros will have the _FMT suffix, while the
migration is in process.

This allows for peacemeal migration over time instead of pulling
everything out and replacing it all in a single pull request, which
makes for much easier reviewing.

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