Trick games: full SVG table (opponents, trick, fanned hand)

* cg-trick.el (cg-trick--svg, cg-trick--draw-backs): draw the whole table
as one SVG -- three opponents, the trick in a diamond, the South hand
fanned with cursor, legal-play hints, and pass marks; hand cards carry
(hand . INDEX) click regions.  (cg-trick--render-text): the text fallback.
(cg-render): dispatch SVG on a graphical display, else text.  Add a footer
legend; refresh the help.  Covers Hearts, Spades, Whist, Oh Hell, and the
Euchre/Pitch/Briscola subclasses.
* test/card-games-tests.el: add cgt-trick-svg-smoke, cgt-trick-svg-bidding.
* NEWS: note the trick-taking SVG table.

cg-president.el

@@ -400,6 +400,7 @@ Each rank maps to a (hand . INDEX) region and a card-size slider sits below."
     (define-key map "n" #'cg-pres-new)
     (define-key map "g" #'cg-pres-redraw)
     (define-key map "?" #'cg-pres-help)
+    (define-key map "q" #'cg-quit-to-menu)
     map)
   "Keymap for `cg-pres-mode'.")