HttT S06 Use capture and radius

Instead of a moveto, use a capture event so the theives only appear when actually capturing a village on the island.

Instead of listing the position of each village, use a radius so we can move them around, or add or remove a village more easily.

data/campaigns/Heir_To_The_Throne/scenarios/06_The_Siege_of_Elensefar.cfg

@@ -374,10 +374,12 @@
                     # one of the Elensefar villages
                     #
                     [event]
-                        name=moveto
+                        name=capture
                         [filter]
-                            x=14,15,18,19,13,14,18,20,21
-                            y=28,30,30,27,24,22,23,23,25
+                            [filter_location]
+                                x,y=16,26
+                                radius=5
+                            [/filter_location]
                             side=1
                         [/filter]
                         [message]