Custom Audio: Add each hyrule field sequence to the audio editor.

My mod i'm working on requires that each hyrule field sequence be customizable in the audio editor. For example, the sequences that occur when near an enemy, moving around, idle, etc. A separate hyrule field tab or overworld tab may be in order to accommodate this. And with the newly added hyrule field morning bgm it conflicts with the main hyrule field bgm if you customize them, the main theme will play ignoring the morning bgm.