Add DNG support

[EmberLightVFX]

Changelog Description

This PR adds .dng as an image extension in IMAGE_EXTENSIONS and adds .dng to image, plate and render for the tray publisher.

Additional info

Maybe some good to know about dng:
DNG (digital negativ) is the standard format used for film-scans and used in as good as all projects that has bin filmed on real film.
By default scans ends up in cineon log with a srgb gamut. It's the same as what RedLogFilm uses.

Testing notes:

1. Publish a dng image or sequence.
2. Load the dng sequence in Nuke or Fusion

[BigRoy]

Didn't test it - but changes look good to me!

Just linking the community forum post as well for cross-referencing the topics.

[MustafaJafar]

I think Tray publisher addon version should be bumped as this PR updates its settings.
what do you think @iLLiCiTiT ?

[iLLiCiTiT]

I think Tray publisher addon version should be bumped as this PR updates its settings.

Yes, settings change >>> version bump.

[EmberLightVFX]

Yes, settings change >>> version bump.

Where do I bump the tray-publisher version?

[BigRoy]

Yes, settings change >>> version bump.

Where do I bump the tray-publisher version?

Should be this one:

ayon-core/server_addon/traypublisher/server/version.py

Line 3 in aa70e2d

__version__ = "0.1.3"

[EmberLightVFX]

Should be this one:

ayon-core/server_addon/traypublisher/server/version.py

Line 3 in aa70e2d

__version__ = "0.1.3"

Ahh true! I was looking in the client folder... Head is still in OpenPype sometimes

[EmberLightVFX]

The linting check failed when I bumped up the version :S no idea why

[BigRoy]

The linting check failed when I bumped up the version :S no idea why

You can ignore that - for now that'll be happening on any commit due to this recent merge #192

Work is being done to resolve that in #196

[BigRoy]

Looks good to me. Maybe up to @antirotor or @jakubjezek001 to look into whatever we need to do with that linter stuff.