2.2.1

• Images in RAW format are saved with '.data' file extension instead of '.raw'.
• Image type is now preserved, instead of always using the RGB type.
  E.g. if the image is indexed, the exported layers will be indexed as well.
  File formats that don't support the an image type (such as indexed) will
  automatically convert the type as appropriate (the same way the Export menu does).
• Renamed "Use image size instead of layer size" to just "Use image size" for the sake of brevity.