Introduces a crude Python script that can extract release notes from the
changelog for a given version and convert it to one of three different
output formats:
- `github` for GitHub Releases. This is just the Markdown itself, but
with the very first line (the version) removed, because the version is
also the title of the release itself.
- `spigot` for Spigot Resources. This is the BBCode format used on the
forums and in the resource descriptions.
- `curse` for CurseForge File Uploads. Curse uses a so-called "WYSIWYG"
format that's really just HTML underneath.
The formats for Spigot and CurseForge are straightforward to convert to
as long as we only use simple text formatting, bullet lists, and links,
but that is really all the changelog should consist of anyway.
While this script already makes the release process quite a bit easier
on its own, the end goal is to _automate_ releases as much as possible,
and to do that, we need to be able to extract release notes, and we need
to be able to do it from GitHub Actions, which is quite a bit simpler if
we don't use third-party libraries.
Publishing releases on GitHub is almost trivial, while CurseForge is
pretty easy, and Hangar should be very doable as well. Spigot, on the
other hand, is stuck in the dark ages, so we must continue to upload
files manually there.
