Fix warnings.

A lot of formatting string warnings fixed, especially ones related to
the NS[U]Integer, which isn't allowed in format strings.

Deprecation warnings squelched in Athena.  All of Carbon, including the
resource manager, is now deprecated, so we otherwise get a bunch of
irrelevant warnings from that.

All vorbis warnings squelched; we wouldn't fix those here.

A couple of others too.