Draft: Zip using vfs

Uses: !325 (merged)

This implements zip supporting using golang zip:

• builds on top of existing VFS implementation
• can read disk files
• can read remote files
• reimplements a small aspect of ZIP support to be "more efficient" in accessing data, and always have bounded type of access
• implements time-based caching of ZIP archive
• parses a list of files, and stores it in a map for efficient access
• supports symlinks
• has a proper OOM
• has a proper support for Etags

This compiles and works properly