Dangun III - original background scores

Loading / camp: existing project tracks public/bgm/loading.mp3 and
public/bgm/stage-select.mp3, composed with tools/gen-menu-bgm.py.
Combat: composed with tools/unity/make-battle-bgm.py using the same
project synthesis helpers. Seed 270926; 102 BPM; 16 bars; stereo.

All three scores use synthesized tones/noise. No samples, downloaded
recordings or third-party musical compositions are used. Flute, plucked
string, bowed bed and percussion sounds are synthesized approximations.

The existing loading/camp MP3 bytes are preserved. The new combat master
is encoded as stereo MP3 VBR quality 5. Temporary WAV masters are not
included in the deployment. Source metadata accompanies the combat MP3.