split files by license

[matu3ba]

It sounds nicer to me to split Apache derived files and ideally put them into a package.
This would also allow eventual usage of SPDX ids via package manager. Opinions?

Afaik, SPDX does not allow explicit tagging of code ranges, so doing things differently would not be strictly standard-conform. However, feel free to disagree in what the package manager should use.

[Validark]

The reason why it's all in one file for now is just because it's more convenient for me. I know I can objdump on my own machine but it's nice to be able to drop it into Godbolt's Compiler Explorer, I just like the interface and the way you can see which lines compiled to which instructions. I definitely plan on splitting it up though.

[Paul-Dempsey]

Afaik, SPDX does not allow explicit tagging of code ranges

It does. See https://spdx.github.io/spdx-spec/v2.3/file-tags/#h3-snippet-tags-format