Lighttable default overlay text and darkroom information line improvements

[bastibe]

The default lighttable extended overlay texts and darkroom information lines show only the basic exposure parameters and file name, but there is typically room for some more text. This pull request adds some more information and formats the information that is there a bit more nicely.

In particular, it adds information about the camera and lens used, and uses a bold font for the exposure parameters. It also adds a unit to the shutter speed, to make it more easily distinguishable from the other values. And it removes the center dot between the exposure parameters to save space. Thanks to the bold font, there is enough structure to the text to remain legible.

Original	Improved

(no idea why the left thumbnail is smaller than the right. The images are the same size.)

[bastibe]

To try these new defaults, here they are in plain text:

Lighttable pattern for the thumbnail extended overlay text:

$(EXIF.MODEL) $(EXIF.LENS)$(NL)$(FILE_NAME).$(FILE_EXTENSION) • <b>$(EXIF_EXPOSURE)</b>s f/<b>$(EXIF_APERTURE)</b> <b>$(EXIF_FOCAL_LENGTH)</b>mm ISO<b>$(EXIF_ISO)</b> $(SIDECAR_TXT)

Darkroom pattern for the image information line:

$(EXIF.MAKER) <b>$(EXIF.MODEL) $(EXIF.LENS)</b> • $(FILE_NAME).$(FILE_EXTENSION) • <b>$(EXIF_EXPOSURE)</b>s <b>$(EXIF_FOCAL_LENGTH)</b>mm f/<b>$(EXIF_APERTURE)</b> ISO<b>$(EXIF_ISO)</b>

[wpferguson]

I prefer the image on the left. IMO the image is what is important and I only look at the info if I need to. However, if it's configurable then I have no objection as long as it doesn't overwrite my current setting.

[Donatzsky]

I like the bold numbers, but the other changes very quickly break things if the filename or lens string are even just slightly longer than in the example.

2024-09-22t14-42-32_1461.cr2
Sigma 35mm f/1.4 DG HSM *OR* Sigma 35mm f/1.5 FF High-Speed Prime | 017

As should be obvious, that's not very usable.

I do already have the extra camera and lens information in the darkroom, however, since I find it can be useful at times:

But, if we also put the filename in there, it too risks breaking:

[bastibe]

Interesting discussion!

It seems that some values, such as lens and file names, are dangerous as a default value, as they are liable to be too long.

Perhaps these things should better be left as customization options then.

Feel free to close this, or continue discussing it. I'd be happy to change the defaults in this PR to something else if we find a consensus.