Reverse Engineered Serum 2 Preset File Format and Tool to Unpack It to JSON

There has been some [recent discussion in the comments](https://gist.github.com/0xdevalias/5a06349b376d01b2a76ad27a8...) on my gist of notes related to figuring out the Serum preset file format; with a lot of the recent comments relating to the Serum 2 `.SerumPreset` file format.

When I [shared some podcast notes](https://gist.github.com/0xdevalias/5a06349b376d01b2a76ad27a8...) of Steve Duda talking about how he eventually wants to open the preset format, it [inspired another user to dive deeper](https://gist.github.com/0xdevalias/5a06349b376d01b2a76ad27a8...) into figuring out the v2 preset format; which as of yesterday, they have [basically figured out completely](https://gist.github.com/0xdevalias/5a06349b376d01b2a76ad27a8...), and created a tool that can pack/unpack v2 presets:

- https://github.com/KennethWussmann/serum-preset-packager

That tool doesn't have support for Serum v1 `.fxp` preset files (though Serum 2 can convert the legacy presets.. so you could technically access them that way); but this recent discussion did [inspire me to find/share my old notes/tools](https://gist.github.com/0xdevalias/5a06349b376d01b2a76ad27a8...) from when I was digging into the `.fxp` format. While it's not fully figured out, it's definitely a good starting point for anyone interested in looking deeper; and I also made this issue on the tool to summarise the relevant context/resources for the `.fxp` format:

- https://github.com/KennethWussmann/serum-preset-packager/iss...