Add the same context menu to commits in the blame view as in the graph

[Mingun]

Currently you may click to the SHA hyperlink in the blame view to focus that commit in the graph and copy data from the context menu of the graph. But:

• I suppose, not all commits may be shown in the graph (because there is a setting for maximum depth). So the details of such commits cannot be copied?
• you may want to not change selected commit in the graph to not loose context

I think, the commit in the blame may have the same context menu as in the graph.