Support for Zip File Based Mods

[joshuaskelly]

Summary

Enable mods to be loaded from zip files. This work is both for convenient packaging and to support remote mod sources.

References

• https://gist.github.com/MobiDevelop/5514357#file-archivefilehandle-java
• https://github.com/libgdx/libgdx/issues/6212

[joshuaskelly]

Closing issue for now as we need a writable solution to support our script system.