Foundation for in browser downloading

This adds /download as a URL to immediately download the file, this will allow html changes that initiate a file download.

aiserver.py

@@ -491,6 +491,33 @@ else:
 @app.route('/index')
 def index():
     return render_template('index.html')
+@app.route('/download')
+def download():
+    # Leave Edit/Memory mode before continuing
+    exitModes()
+    
+    # Build json to write
+    js = {}
+    js["gamestarted"] = vars.gamestarted
+    js["prompt"]      = vars.prompt
+    js["memory"]      = vars.memory
+    js["authorsnote"] = vars.authornote
+    js["actions"]     = tuple(vars.actions.values())
+    js["worldinfo"]   = []
+        
+    # Extract only the important bits of WI
+    for wi in vars.worldinfo:
+        if(wi["constant"] or wi["key"] != ""):
+            js["worldinfo"].append({
+                "key": wi["key"],
+                "keysecondary": wi["keysecondary"],
+                "content": wi["content"],
+                "selective": wi["selective"],
+                "constant": wi["constant"]
+            })
+    save = flask.Response(json.dumps(js, indent=3))
+    save.headers.set('Content-Disposition', 'attachment', filename='%s.json' % path.basename(vars.savedir))
+    return(save)
 
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