[request] Paste Timestamp improvements

[Unknow0059]

"Paste timestamp" is a verb I can bind into a Quick Paste Shortcut.

I can only use said shortcut whenever Ditto is open (#64) , moreover, copies are pasted alongside that, which is nice, but for my use, I just need an copy that contains nothing.

I can workaround this by placing an empty sticky as the first entry, but I'd rather not do that.

Also, if there's a way to change the datetime format pasted, I have not found it.

[sharchun]

Maybe this helps, at least for your last item? #520