Look for AI profiles in two different locations

We'll now search for AI profiles in:

* ~/.config/gnome-chess/engines.conf (first)
* /etc/gnome-chess/engines.conf

I'm torn as to whether to continue reading /etc/chess-engines.conf. I
think it'd be best to ignore it -- if users modified it manually to add
an engine, they will notice that the engine has disappeared. They're not
likely to notice that they're not getting the important GNUChess
improvements I'm hoping to land soon....
appdata: specify project_group
Updated Indonesian translation
Update man page
Pause the game when displaying Claim Draw dialog
Put buttons for common actions into the header bar
Add some margin to the nav box
Fix color in message when White is checkmated
Revert "Remove extra space between White and Black timers"

This reverts commit 73bf554d6bf4bb8f6a36f1b8c0ac1300716ddf74.

This exacerbates our issues with the resizing nav bar items
Switch GNU Chess to UCI mode

Guess wildly at reasonable difficulty settings.
Correctly spell "GNU Chess"
Add a delay before the computer moves

Slowing down the game makes it less overwhelming.
Revert "Swap Pause/Resume menu label as appropriate"

This reverts commit af1d76a4dcde59be1f1bbc1226b8e508da3eae2f.

Let's use a button for Pause instead.
Use a button for pause/resume
Show pause button only in timed games
Shorten the window subtitle when there's a bug

This is too long in English when the pause button is present.
Disallow 3D mode when running outside of X11

3D mode is currently X-specific. Making it work in Wayland and Mir will
be future work.
Prepare 3.11.90
Updated Hebrew translation
Add missing news entry for engines.conf change