Add sound file handling

[krogenth]

Currently, there is little known in regards to how audio is actually handled within the game. This includes how audio looping is handled(the game uses OGG files, but the files do not appear to specify the looping as one would expect), and how music/sound selection is actually handled(how does the game determine what to play and when?).

A possible lead on the audio loading/looping would be the content/data/sound/sound_indices.csv file, which appears to list all audio files, along with an index, and some other data.

As such, there will be several tasks:

• add parsing and playing of the OGG audio files(or whatever the actual audio files are)
• determine how the game chooses audio to play(possibly dialogue opcodes?)
• determine how the game handles looping(external file? handled on a per-map basis?)
• add parsing & handling of whatever audio selection mechanism there is
• add parsing & handling of whatever audio looping there is

[krogenth]

Doing a small bit of digging, there appears to be some set definitions for what event causes a track to stop playing(i.e. - entering battle, map transition, etc.). While I haven't dug into what means what yet, the data is found in the content/data/sound/sound_indices.csv file. It will be on the of the two middle integer values for each track(or possibly both, unsure yet).