feat: add IPTC, EXIF and XMP metadata attributes to image elements

[therobrob]

• added EXIF and IPTC metadata support for artist and CopyrightNotice fields.
• added the information to figcaption
• modified intercity direct map – apparently, the metadata doesn't work with WebP, so I uploaded it as a JPG for now.

ToDos:

• add an note to archetypes.
• check webp support
• our webp images seem to have no copyright information anymore. We have to restore it / add it manually again..

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[github-actions]

Hi there! 👋

Thank you for your contribution to the FIP Guide! 🚀
We appreciate your effort in making rail staff travel information more accessible. 🚄

Checklist before merging:

• Added a description to the Pull Request
• Checked the License of new pictures (non-commercial use without attribution)
• Modified content in English
• Modified content in German
• Modified content in French

[lenderom]

From the review of @therobrob and @lenderom :
It's a nice technical implementation however it doesn't work with .webp. So it would be a step back from our perspective if we change every picture to jpg just to use the metadata. For pictures at the end of the page or news articles isn't a real need for this.

[MoritzWeber0]

From the review of @therobrob and @lenderom :
It's a nice technical implementation however it doesn't work with .webp. So it would be a step back from our perspective if we change every picture to jpg just to use the metadata. For pictures at the end of the page or news articles isn't a real need for this.

As far as I know, Git also has no proper handling of metadata changes. It's probably treated as a reupload of the file to the repository, which is inefficient.

We thought of sidecar json files before that contain the metadata, maybe that's still an option.