Search Inside of ZIP and Archive Files

[JosephCatrambone]

Indexing of images is restricted to plain image files on disk and in directories and does not include compressed or archived files. We should search and index inside of zip files, gz files, etc, so people who don't uncompress their assets can still search files.

This will mean a nontrivial change in how the file spidering is done and it might be a real pain in the butt.