Compress sound files to .ogg for space saving

Compressed using ffmpeg -c:a libvorbis -q:a 9 -ar 48000

This reduces the size of the sound files from 8MB to 1,4MB, which is about 17% of their original size, while keeping a quality level of 9 (targeting 320kbps VBR)

Ogg Vorbis I is the only compressed format supported by the specification and libcanberra. (http://0pointer.de/public/sound-theme-spec.html)

CC: @broulik