Added icon to save-as menu items

Author: CoderAllan

templates/showHierarchy_Template.html

@@ -17,9 +17,9 @@
     <div class="dropdown">
       <button id="saveAsButton" ><i class="fas fa-file-download"></i> Save as ...</button>
       <div class="dropdown-content">
-        <a href="#" id="saveAsPngButton">Save as Png</a>
-        <a href="#" Id="saveAsDgmlButton">Save as Dgml</a>
-        <a href="#" Id="saveAsDotButton">Save as Dot</a>
+        <a href="#" id="saveAsPngButton"><i class="fas fa-file-image"></i> Save as Png</a>
+        <a href="#" Id="saveAsDgmlButton"><i class="fas fa-file-code"></i> Save as Dgml</a>
+        <a href="#" Id="saveAsDotButton"><i class="fas fa-project-diagram"></i> Save as Dot</a>
       </div>
     </div>
     <button id="regenerateGraphButton" title="Regenerate the graph"><i class="fas fa-sync"></i></button>