Support CURRENT_VERSION file - could become the new norm?

[BenWoodford]

Right now it seems to be an edge case from one modpack maker (World of Dragons/Winter is Here) but could become a common thing if it catches on. Instead of bundling the Forge Installer JAR they provide a CURRENT_INSTALLER file which has the URL to the relevant JAR.

I got it working by manually extracting the server files (rather than using TYPE=CURSEFORGE) and using TYPE=FORGE while providing the FORGE_INSTALLER_URL as the contents of the CURRENT_INSTALLER file.

Looking for one of an array of files (let's assume the Modpack community doesn't want to follow a single standard) and using that as the installer URL to download would be the most apt approach

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