TDG: update Saurian Juvenile sprites (#9945)

Updating the sprites for the saurian juvenile in TDG, and added a bobbing standing animation. Colorset of the Saurians respects the ColorMap of the Saurians with some exceptions in the clothing.

data/campaigns/The_Deceivers_Gambit/scenarios/08_Ruins_of_Saurgrath.cfg

@@ -251,18 +251,22 @@
         # SAURIAN CIVILIANS
         #############################
 #define SPAWN_JUVENILE X Y
-    {VARIABLE_OP image rand "saurian1.png,saurian2.png,saurian3.png,saurian4.png"}
+    {VARIABLE_OP image rand "juvenile,juvenile_backpack,juvenile_cloaked,juvenile_devotee"}
     {GENERIC_UNIT 9 (Saurian Juvenile) {X} {Y}}
     {ADD_MODIFICATION(
         [object]
             {EFFECT new_animation (
                 [standing_anim]
-                    base_score=99 {FRAME image="units/civilian/$image"}
+                    start_time=0
+                    base_score=99
+                    [frame]
+                        image="units/saurian-juvenile/$image-bob[1~6].png:200"
+                    [/frame]
                 [/standing_anim]
             )}
             {EFFECT new_animation (
                 [movement_anim]
-                    base_score=99 {FRAME image="units/civilian/$image"}
+                    base_score=99 {FRAME image="units/saurian-juvenile/$image.png"}
                 [/movement_anim]
             )}
         [/object]

data/campaigns/The_Deceivers_Gambit/units/Saurian_Juvenile.cfg

@@ -1,9 +1,10 @@
 #textdomain wesnoth-tdg
+
 [unit_type]
     id=Saurian Juvenile
     name= _ "Saurian Juvenile"
     race=lizard
-    image="units/civilian/saurian1.png"
+    image="units/saurian-juvenile/juvenile.png"
     alignment=chaotic
     hitpoints=18
     cost=5