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js: Add a way to have environment variables

They can now be specified by sticking some JSON in a <script> element in
the Web page:

<script id="environment" type="application/json">
   { "LOOPY_DEFAULT": "20x10t11dh" }
</script>

This isn't brilliantly useful, but it does allow for changing settings
without recompiling.

--- a/emccpre.js

+++ b/emccpre.js

@@ -548,6 +548,19 @@

         rescale_puzzle();

     }

+    Module.preRun = function() {

+        // Merge environment variables from HTML script element.

+        // This means you can add something like this to the HTML:

+        // <script id="environment" type="application/json">

+        //   { "LOOPY_DEFAULT": "20x10t11dh" }

+        // </script>

+        var envscript = document.getElementById("environment");

+        if (envscript !== null)

+            for (var [k, v] of

+                 Object.entries(JSON.parse(envscript.textContent)))

+                ENV[k] = v;

+    };

+

     Module.onRuntimeInitialized = function() {

         // Run the C setup function, passing argv[1] as the fragment

         // identifier (so that permalinks of the form puzzle.html#game-id

-- 

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