[Enhancement] When comparing 2 commits, use same feature-set as when comparing 2 branches/tags

[goran-w]

If we select 2 branches (or 2 tags) in sidebar and select "Compare selected 2 branches" (or "Compare 2 tags") from context menu, then the resulting Compare window has some extra features (which are not present in the "embedded" comparison view resulting from selecting 2 commits in the log-graph) :

• The left/right (red/green-framed) commit-details boxes show branch/tag "badges" (and if one of them is the current branch it also displays a checkmark next to it).
• There's a special Changes/Commits selector, which (when switched to Commits) changes the main panel to show two vertically stacked panels for Left-only and Right-only commits.
• If one of the 2 sides (left/right) is the "current" branch/HEAD, then we can select commits from the other side and choose "Cherry-pick..." from context menu.

NOTE: Parts of this functionality was briefly discussed here.

It would be great if this functionality could be "unified", to be available also when simply selecting 2 commits in the log-graph (which shows a similar but less capable comparison view ) :

• Show branch/tag badges in the commit-details boxes (when applicable), including the checkmark for current branch (or detached HEAD). Currently, only a HEAD badge (without checkmark) is shown for current branch, it would be better to show actual branch name(s).
• Display the Changes/Commits selector (at least whenever applicable).
• Include the "Cherry-pick..." functionality (when possible).