Support HUGETracker's .uge music format for authoring Sound Effects as well

[Lollie]

It is particularly frustrating that GBS does not currently support HUGETracker's .uge files for sound effects, despite .uge being the default format for music. Music and sound effects share the same sound channels, so it seems like a complete no-brainer to be able to use the same music tools for authoring sound effects as well.

Current alternatives:

1. Use save files for FX Hammer, a tool that must be run via a Game Boy emulator or flash cart. While there are benefits to using the Game Boy itself to author sound effects (what you hear is what you get), the tool artificially limits the channels available for use.
2. Use an alternate music tool (eg: Furnace) that can export .vgm files. This can require the user to hex-edit the resulting exports just to make them usable in GB Studio — and in fact, this workflow has resulted in VgmGBStudionator, a tool that automates the hex-editing of .vgm files specifically for use in GB Studio. This shouldn't have to be a necessary step.
3. .wav files. This is the simplest option, but also the most limited.

The solution I would like to see is hopefully the path of least resistance:

• Allow users to author sound effects with GB Studio's own built-in music editor.
• Allow users to supply .uge files authored in HUGETracker.