Reimplement Installer #20
Description
While reimplementing the installer codebase isn't explicitly necessary, it's the path I'm taking to fulfill two goals that I want to reach:
- Make the installer run on Java 8, and
- Remove any upstream code or redundant upstream toolchain dependency (be it Fabric, Quilt or otherwise)
Since we support a lot of older Minecraft versions, and all of the versions that we support use Java 8 or under, many people still use JDK 8 to run their Minecraft clients or servers; since our current installer uses Java 17, users might run into problems (or at least be inconvenienced) when trying to run it.
Tangentially related to the previous issue, basing our installer off of another project's installer leaves us with extra features that we don't need and might need to remove anyway to support our toolchain. I believe it would be better to write the installer based on our need from the beginning, instead of adapting someone else's code to fit our needs.