Add restart and exit buttons, add restart shortcut, fix restarting on specific measures

public/src/views/debug.html

@@ -10,4 +10,8 @@
 		<span class="reset">x</span><input type="text" value="" readonly><span class="minus">-</span><span class="plus">+</span>
 	</div>
 	<label><input class="change-restart" type="checkbox">Restart on change</label>
+	<div class="bottom-btns">
+		<div class="restart-btn">Restart song</div>
+		<div class="exit-btn">Exit debug</div>
+	</div>
 </div>