Player_LoadTitle() returns an aligned pointer in libmikmod-3.2 that
cannot be freed with free(). The correct way to do this now is
MikMod_free() which extracts the original pointer from the buffer and
frees that.
Signed-off-by: Christoph Mende <mende.christoph@gmail.com>

Now that even Debian stable has picked up version 0.8, we can safely
make this a requirement, and remove a lot of old cruft.

This old version has been obsolete for many years - time to remove it.

Allow reusing Tag instances.

Avoid duplicating the tag.

Eliminate the fallback strndup() and strnlen() implementations.

Cast to integer after multiplying with 1000.  Allows sub-second
seeking.

Only relevant for old ffmpeg versions.