changing zipfileprovider to subtree
Squashed 'libs/zipfileprovider/' content from commit 13f2c29

git-subtree-dir: libs/zipfileprovider
git-subtree-split: 13f2c293f64cff630e9bba9d4acfb86bcfcec5d9
Merge commit 'd957423eb5566df0424f320310bec5c228b956fb' as 'libs/zipfileprovider'