ext/img_display: support raw img preview in kitty

[pkeroulas]

ISSUE TYPE

• Improvement/feature implementation

RUNTIME ENVIRONMENT

• Operating system and version: Ubuntu 22.04
• Terminal emulator and version: kitty 0.26.4
  ranger version: ranger 1.9.3
  Python version: 3.10.12 (main, Nov 20 2023, 15:14:05) [GCC 11.4.0]
  Locale: fr_FR.UTF-8

CHECKLIST

• [ x] The CONTRIBUTING document has been read [REQUIRED]
• [ x] All changes follow the code style [REQUIRED]
• [ x] All new and existing tests pass [REQUIRED]
• Changes require config files to be updated
  • Config files have been updated
• Changes require documentation to be updated
  • Documentation has been updated
• Changes require tests to be updated
  • Tests have been updated

DESCRIPTION

Extract and save the thumbnail from raw using rawpy and replace path.

MOTIVATION AND CONTEXT

Raw image can't be previewed since PIL doesn't support them.

TESTING

Provided example is tested with Olympus files (.ORF).

[markus-bauer]

I'm not a ranger dev, but AFAIK, stuff like this should be done in scope.sh.
Convert the image to a jpg, save as IMAGE_CACHE_PATH, exit with code 6.
That way, all internal image preview methods can use the cache image.

[pkeroulas]

@markus-bauer thanks for the feedback. Your suggestion works fine.
Do you think a PR worth it or scope.sh is more like a user config?

[markus-bauer]

@pkeroulas
I'm not the one to ask, sorry.
Just keep this PR open and wait for an "official" response. I wouldn't do more work until then.