WorldDownloaderLegacy

• Initial modrinth release
• Now logs the mod (& mc) version to WorldDownloader.txt

The original LiteLoader version is completely borked for me in 1.9.4, and not many servers are on 1.9 (this is basically only for Funcraft), so only porting important bug/crash fixes.

• Initial 1.9.4 release

• Backported this commit (& a bit of this one) to prevent NullPointerExceptions on empty chunks

• Now saving empty chunks

• Version number normalized to 1.0.0-1.9.4