[Vm-dev] Overhead in mczs, MCVersionInfo

[Stephan Eggermont]

I've done a little experiment with the VMMaker repo.
I've constructed an archive format for storing all mcz's in a repo 
storing all unique MCDefinitions once, and deduplicating the 
MCVersionInfos.

Instead of a package cache with 2725 items taking 6.1 GB I now have an
archive that is 123 MB, compressed 70.8. Deduplicating the MCDefinitions 
alone was responsible for a reduction to 1.2 GB

Stephan