Add "Right click -> Copy cell value" and keyboard shortcuts for copying cell values in the table view

[cyrozap]

I'd like to be able to copy the text, "AmiStandardDefaultsVariable" (see screenshot), but there isn't any option to do so, whether by right-clicking or using keyboard shortcuts. I'm aware that some elements have UI sections with text values that can be copied, but that isn't available for all the text that is visible in the UI.

[NikolajSchlej]

Should not be hard to implement, will add it to pending features for the next release.