ADAPTIVE IMAGES CRUNCH PLUGIN
  =============================

    - NOT A SERVICE
    - NO API KEY
    - FREE AIF
    - LOSSY JPG
    - LOSSLESS PNG
    - PNG2JPG

  Kraken, 
  EWWW, 
  Smushit, 
  TinyJPG,
  TinyPNG,
  ShortPixel, 
  Prizm,      => requireS API key
  EWWW,       => requires API key for JPEGs
  Imsanity,   => has no support for true batch compression
  CW          => has no support for lossy JPEG compression

  <img sizes="(min-width: 300px) 1024px, (min-width: 150x) 300px, 150px"
       srcset="thumbnail.jpg 150w,
       medium.jpg 300w,
       large.jpg 1024w"
       alt="Image description">

  <picture>
      <source srcset="full-size.jpg" media="(min-width: 1024px)">
      <source srcset="large.jpg" media="(min-width: 300px)">
      <source srcset="medium.jpg" media="(min-width: 150px)">
      <img srcset="thumbnail.jpg" alt="Image description">
  </picture>

  Settings

    - max width
    - max height
    - jpeg quality
    - lossy/lossless jpeg
    - png compression level
    - image types to include
    - date before which to delete images

  *** BE SUPER CAREFUL WITH PNGs, ALPHA TRANSPARENCY, ETC
  *** PROCESS IS IRREVERSIBLE - IMAGES CANNOT BE REINSTATED
  *** CHECK wp_handle_upload_prefilter 

  Functions

    - Crunch: compress and resize image
    - Run recursively on a directory
    - Run on WordPress attachments
    - Batch crunch on demand
    - Partial batch crunch on demand
    - WP-Cron batch crunch
    - On image upload crunch
    - On demand, per image crunch
    - Record which images have been crunched in the past
    - Warn that the process is irreversible
    - Keep record of crunched images

  Why

    - Reduce overall website storage
    - Quicker backups
    - Precious SSD storage
    - Reduce page download times