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js: Add a new function whereby C can ask JS for a preferred board size

Currently JS has no opinion.

--- a/emcc.c

+++ b/emcc.c

@@ -83,6 +83,7 @@

 extern void js_canvas_copy_from_blitter(int id, int x, int y, int w, int h);

 extern void js_canvas_remove_statusbar(void);

 extern void js_canvas_set_statusbar(const char *text);

+extern bool js_canvas_get_preferred_size(int *wp, int *hp);

 extern void js_canvas_set_size(int w, int h);

 extern double js_get_device_pixel_ratio();

@@ -192,8 +193,10 @@

 static void resize()

 {

     int w, h;

+    bool user;

     w = h = INT_MAX;

-    midend_size(me, &w, &h, false, js_get_device_pixel_ratio());

+    user = js_canvas_get_preferred_size(&w, &h);

+    midend_size(me, &w, &h, user, js_get_device_pixel_ratio());

     js_canvas_set_size(w, h);

     canvas_w = w;

     canvas_h = h;

--- a/emcclib.js

+++ b/emcclib.js

@@ -564,6 +564,20 @@

     },

     /*

+     * bool js_canvas_get_preferred_size(int *wp, int *hp);

+     *

+     * This is called before calling midend_size() to set a puzzle to

+     * the default size.  If the JavaScript layer has an opinion about

+     * how big the puzzle should be, it can overwrite *wp and *hp with

+     * its preferred size, and return true if the "user" parameter to

+     * midend_size() should be true.  Otherwise it should leave them

+     * alone and return false.

+     */

+    js_canvas_get_preferred_size: function(wp, hp) {

+        return false;

+    },

+

+    /*

      * void js_canvas_set_size(int w, int h);

      * 

      * Set the size of the puzzle canvas. Called whenever the size of