Adjusted movement to restrict water and cave.

Higher defense on sand and normal def in caves.

data/campaigns/Under_the_Burning_Suns/units/Dust_Devil.cfg

@@ -6,6 +6,19 @@
     image=dust-devil.png
     hitpoints=28
     movement_type=undeadfly
+    [movement_costs]
+      deep_water=99
+      shallow_water=3
+      swamp_water=3
+      cave=2
+      fungus=2
+      canyon=2
+    [/movement_costs]
+    [defense]
+      sand=40
+      cave=50
+      cavewall=50
+    [/defense]
     [resistance]
         blade=70
         pierce=50