Fixed chime onResume and soundpool memory leak

App should be back to stable.
Soundpool now releases resources on pause and re-loads on resume.
Can't get app to lose audio anymore, but needs more testing.
   ^ Was able to break before by cycling in and out of app fast

Implemented a little bit of error recovery in worst case scenario.

Moved mp3 files to separate folder just in case we need them again.
Converted audio to .ogg files at suggestion from stack overflow.

Also processed files a bit for volume and length. Could benefit from some
trimming at the beginning of some notes so the chords chime better in phase.

For uniformity, ogg files in raw/ are all normalized to -10db full scale,
trimmed at 1.5 seconds, and then added audacity effect "fade out" from start
to finish.