Add POIs checkbox to map

defaults.xml

@@ -813,6 +813,7 @@ Started September 2000 by David Megginson, david@megginson.com
         <draw-heliports type="bool" userarchive="y">false</draw-heliports>
         <draw-traffic type="bool" userarchive="y">false</draw-traffic>
         <draw-flight-history type="bool" userarchive="y">false</draw-flight-history>
+        <draw-pois type="bool" userarchive="y">true</draw-pois>
 
         <magnetic-headings type="bool" userarchive="y">true</magnetic-headings>
         <centre-on-aircraft type="bool" userarchive="y">true</centre-on-aircraft>

gui/dialogs/map.xml

@@ -122,6 +122,19 @@ command interface /autopilot/route-manager/input:
                   <command>property-toggle</command>
                 </binding>
             </checkbox>
+
+            <checkbox>
+                <label>Landmarks</label>
+                <halign>left</halign>
+                <property>/sim/gui/map/draw-pois</property>
+                <live>true</live>
+                <binding>
+                  <command>dialog-apply</command>
+                </binding>
+                <binding>
+                  <command>property-toggle</command>
+                </binding>
+            </checkbox>
 <!--
             <button>
                 <legend>Airways</legend>