Add single-calc-button for individual players. Add settings modal-html.

templates/index.html

@@ -45,6 +45,9 @@
 <!-- Edit Player Modal -->
 {{ template "edit_player" . }}
 
+<!-- Settings Modal -->
+{{ template "settings" . }}
+
 <script lang="javascript">
     document.addEventListener('DOMContentLoaded', function() {
         loadClans();