Cornbread's Music Fixer (Java Style)

((previous version was hosted on another site))

• Made Lena Raine's music play more often in non-Wastes Nether biomes to be more in line with the Bedrock version of the pack.
• Moved Lena's music to the top of the Nether sound events.
• Changed the pack icon to be easier to read in-game (and also 'cause i ported the pack to older MC versions and the previous icon wouldn't make sense there).
• Added changelog.txt.
• Added sound event minecraft:music.lena_raine.swamp for use with the data pack.
  (ignore this one. data pack doesn't exist anymore and never worked.)
• Changed the contents of minecraft:music.overworld.old_growth_taiga to be more in line with the Bedrock version of the pack.