DM S21: Add some visual effects

1) Give elves orcish bows
2) Animate the first two riders when they're spawned, so it
looks like they've been recruited

data/campaigns/Delfadors_Memoirs/scenarios/21_Clash_at_the_Manor.cfg

@@ -202,6 +202,11 @@
             silent=yes
             duration=scenario
             [effect]
+                [filter]
+                    [not]
+                         type=Elvish Hero, Elvish Champion, Elvish Marshal
+                    [/not]
+                [/filter]
                 apply_to=attack
                 name=sword
                 set_icon=attacks/sword-orcish.png
@@ -217,6 +222,27 @@
                 #textdomain wesnoth-dm
                 set_icon=attacks/greatsword-orcish.png
             [/effect]
+            [effect]
+                [filter]
+                    [not]
+                         type=Elvish Marksman, Elvish Sharpshooter
+                    [/not]
+                [/filter]
+                apply_to=attack
+                name=bow
+                set_icon=attacks/bow-orcish.png
+            [/effect]
+            [effect]
+                [filter]
+                    type=Elvish Marksman, Elvish Sharpshooter
+                [/filter]
+                apply_to=attack
+                name=longbow
+                #textdomain wesnoth-units
+                set_description=_"bow"
+                #textdomain wesnoth-dm
+                set_icon=attacks/bow-orcish.png
+            [/effect]
         [/object]
     [/event]
 
@@ -231,6 +257,7 @@
             x,y=27,19
             goto_x,goto_y=1,19
             moves=0
+            animate=yes
         [/unit]
         [unit]
             type={ON_DIFFICULTY Cavalryman Cavalryman Dragoon}
@@ -239,6 +266,7 @@
             x,y=29,21
             goto_x,goto_y=18,33
             moves=0
+            animate=yes
         [/unit]
         [store_unit]
             [filter]