Enhancement: enable multi-row selection in file table

[Szeniel]

Hi!
I would appreciate if I could delete an entire section of images like that:

And not having to just press delete and wait for every image to be deleted.
It would be also quite nice if by adding more images by "Add Folder..." it would create a new section for that folder of images:

[VoxelCubes]

• 1: So, you've imported a bunch of images, but now want to get rid of a few? My assumption is that clicking each one is slower than deleting them all and being more careful when dragging in your images from the file browser, so that'd be the way to do it. I'll double check if adding multi-row selection doesn't break anything, which would allow multi-deletions (with shift to select ranges and ctrl click to select multiple). I think it shouldn't break anything, but if it does, well, I can't justify putting too much effort into this minor QoL thing.

• 2: The tabs are for showing the image details, mixing the usage would make things too confusing. I don't think that's a good idea.

[VoxelCubes]

Oh right, I didn't do multi-selection due to it being single-click to open the image details. I don't think making it double click would be a good idea, since it'd be rather hard to discover otherwise.
Then I suppose disabling the open function when ctrl or shift clicking would work. Any other ideas, @Szeniel ?