Improve our copy to clipboard story

[abey79]

It's relatively easy to copy stuff from the UI (pasting is another story), and can occasionally be very useful.

There are at least two classes of interactions:

• Copy "whatever is selected" upon cmd-C. It can get weird with multi-selection, but for single selection, especially of entities, it would be very useful to simply copy the entity path.
• Add "copy" button in strategic places.
  • Next to time stamp display, to copy a full timestamp with standard-compliant formatting
    
  • ...other places?

Related:

• Add UI feature to allow copying of stream paths to clipboard #6015

[emilk]

When a space view is selected, copying could copy both a descriptive string, and a screenshot :)

• Related: Copy image to clipboard buffer emilk/egui#5424

[nikolausWest]

Another perhaps simpler, perhaps not, thing is just making more data selectable as text so you can copy the text.

[teh-cmc]

At least in the selection and time panels, I've often wanted clicking on a (partial) entity path to copy the full entity path to clipboard.