This attribute is not a URI; it is just the filename without its
parent directory path.  To avoid confusion, let's rename it to
"filename", leaving the struct without a "uri" attribute.

Preparing to move logger calls out of lower-level libaries, and
propagating error details to the caller instead.

And specify whether generic tags are being scanned.

This code has been moved to LoadFromArchive().

Load APE/ID3 tags from archives.

This commit adds support for APE/ID3 tags from NFS/SMB files.

See http://bugs.musicpd.org/view.php?id=4270

Avoid duplicate AllocatedPath::FromUTF8() invocations in two callers.

Don't pass Path::c_str() to tag_stream_scan() which requires a UTF-8
string.

Reduce some unnecessary overhead.

Replaces StatFile(), with a portable data object.