adding new sounds, and some variations

data/units/Elvish_Avenger.cfg

@@ -91,7 +91,7 @@ get_hit_sound=groan.wav
         ability=ambush
         usage=mixed fighter
         unit_description="Elvish Avengers are extremely skillful and extremely quick, powerful in all forms of combat. Avengers are considered the best of all woodsmen in Wesnoth, and can ambush their foes in the forest, because they cannot be seen in the woods until just after they have attacked."
-        get_hit_sound=female-hit.wav
+        get_hit_sound=female-strong-hit.wav
                 [attack]
                 name=sword
                 type=blade

data/units/Elvish_Marksman.cfg

@@ -94,7 +94,7 @@ get_hit_sound=groan.wav
         cost=60
         usage=archer
         unit_description="Elvish Marksman are expert in use of the bow. Their skill guarantees them a 60% chance to hit enemies, even those hidden in difficult terrain. This great skill with the bow compensates for their lack of skill in melee combat and lesser speed."
-        get_hit_sound=female-hit.wav
+        get_hit_sound=female-strong-hit.wav
                 [attack]
                 name=sword
                 type=blade

data/units/Elvish_Sharpshooter.cfg

@@ -95,7 +95,7 @@ get_hit_sound=groan.wav
         cost=90
         usage=archer
         unit_description="The most elite archers in all of Wesnoth, Elvish Sharpshooters are incredibly accurate, guaranteed a 60% chance to hit when attacking, even when firing very quickly. Sharpshooters are excellent at picking off entrenched enemies."
-        get_hit_sound=female-hit.wav
+        get_hit_sound=female-strong-hit.wav
                 [attack]
                 name=sword
                 type=blade