Access the summary screen in replays

[elexis]

For replays, we should add a menu item that leads to the summary screen. If entered from a replay, the summary screen should return back to the game again (unless the game has ended).

This way you could check the stats without exiting the game.

[wraitii]

In 17423:

Add a button to the top bar to access the summary screen in-game or in replays.

No effort was done to prevent players from accessing it since it's impossible to prevent them from doing so anyway.

Fixes #3387 .

[wraitii]

In 17434:

Change the "Summary" button from the top bar to the menu to help support our minimal resolution.
Disable said button for non-observers.
Refs #3387.