apev2mux: write APE tags at end for wavpack files
apev2mux: write APE tags at end for wavpack files

http://www.wavpack.com/file_format.txt:
"Both the APEv2 tags and/or ID3v1 tags must come at the end of the
WavPack file, with the ID3v1 coming last if both are present."

WavPack files that contain APEv2 tags at the beginning of the files
are unplayable on players that use FFmpeg (like VLC) and most other
software (except Banshee). Players that use libwavpack directly can
play the files because it skips the tags, but does not recognize the
tag data at that location.

https://bugzilla.gnome.org/show_bug.cgi?id=711437

jpakkane/gstreamer-plugins-good,ndufresne/gst-plugins-good,ndufresne/gst-plugins-good,jpakkane/gstreamer-plugins-good,ndufresne/gst-plugins-good,wkatsak/gst-plugins-good,jpakkane/gstreamer-plugins-good,vatavuserban/gst-plugins-good,wkatsak/gst-plugins-good,jpakkane/gstreamer-plugins-good,wkatsak/gst-plugins-good,wkatsak/gst-plugins-good,ndufresne/gst-plugins-good,vatavuserban/gst-plugins-good,vatavuserban/gst-plugins-good,vatavuserban/gst-plugins-good