Add wasted (http://wasted.werk01.de) cask

From the website :

    WASTED analyzes the images in iOS APP packages, smart convert or
    re-compresses them and can generate a protocol about the
    compressions results alongside the exported, optimized images. The
    result contains standard JPG or PNG files only. WASTED extracts IPA
    or XARCHIVE bundles temporarily and performs the following steps
    without changing your APP.