WIP: add fullscreen and download save abilities

public/assets/images/test.svg

@@ -1,4 +0,0 @@
-<?xml version="1.0" standalone="no"?>
-<svg viewBox="-5 -5 10 10" xmlns="http://www.w3.org/2000/svg">
-  <circle r="5" fill="purple"/>
-</svg>

public/index.html

@@ -104,7 +104,7 @@
         Loading...
       </div>
 
-      <object type="image/svg+xml" data="assets/images/map1.svg"></object>
+      <object type="image/svg+xml"></object>
 
       <div id="status">
         <span id="hex-counter">Distance: <span id="hex-count">-</span></span>
@@ -120,7 +120,9 @@
           <span class="inning-top">◓</span>
           <span class="inning-bottom">◒</span>
         </span>
-        <button id="show-dialog">Change map</button>
+        <button id="show-dialog" type="button">Change map</button>
+        <button id="fullscreen" type="button">Fullscreen</button>
+        <button id="download-save" type="button">Save</button>
         <span style="white-space: nowrap;">
           Prone: <input type="checkbox" id="toggle-prone-counter" />
           <button type="button" class="set-firing-arc" data-size="small">