DSLR RAW image support

[scheer88]

We can also saveRAW images, as used by major DSLR/mirrorless cameras, by extending the list of files types in: files.dart.

const List<String> imageFormats = [
  '.jpeg',
  '.png',
  '.jpg',
  '.cr2',
  '.cr3',
  '.nef',
  '.arw',
  '.gif',
  '.webp',
  '.tif',
  '.heic',
  '.avif'
];

with RAW formats:

• .cr2: older Canon cameras
• .cr3: Canon RAW images
• .nef: Nikon RAW images
• .arw: Sony RAW images

Android/iOS should even be able to handle many more RAW formats. So far, I was only able to test these formats

Details

• Apple documentation: Supported RAW formats

[scheer88]

related to PR-16