Add the Great Ogre to core

This used to be a custom unit in Legend of Wesmere, but it was removed at some point.

This commit makes Ogre advance to Great Ogre. It may instead be desirable to make this an optional advancement.

data/core/units/ogres/Great_Ogre.cfg

@@ -0,0 +1,56 @@
+#textdomain wesnoth-units
+#Unit imported from Into the Underworld.
+
+[unit_type]
+    id=Great Ogre
+    name= _ "Great Ogre"
+    race=ogre
+    image="units/ogres/great-ogre.png"
+    hitpoints=76
+    movement_type=largefoot
+    [resistance]
+        arcane=80
+    [/resistance]
+    #original movement was 4, raised to 5 to avoid RIPLIB. Elvish_Hunter
+    movement=5
+    #Wired mainline Ogre portrait. Elvish_Hunter
+    profile="portraits/monsters/ogre.png"
+    experience=150
+    level=3
+    alignment=neutral
+    advances_to=null
+    {AMLA_DEFAULT}
+    #Original cost was 33, same as L2 Ogre. Elvish_Hunter
+    cost=43
+    usage=fighter
+    description= _ "Great Ogres are giant creatures that usually live alone in the wilderness, remarkably similar to humans in form, though large and misshapen. While they can be easily outrun or outsmarted, their strength is not to be underestimated."
+    die_sound={SOUND_LIST:OGRE_DIE}
+    #decreased from 16 to 15, as Tet suggested. E_H.
+    [attack]
+        name=cleaver
+        #textdomain wesnoth-units
+        description=_"cleaver"
+        #textdomain wesnoth-low
+        type=blade
+        range=melee
+        damage=15
+        number=3
+    [/attack]
+
+    #Unfortunately lacking any animation. Since I'm not an artist (I can barely hold a pencil in one of my two left hands :-P)
+    #if any artist likes the concept, any graphic help will be greatly appreciated. Still, I hope that players will like my idea.
+    #Elvish_Hunter
+
+    {DEFENSE_ANIM "units/ogres/great-ogre.png" "units/ogres/great-ogre.png" {SOUND_LIST:OGRE_HIT} }
+
+    [attack_anim]
+        [filter_attack]
+            name="cleaver"
+        [/filter_attack]
+        start_time=-100
+        [frame]
+            image="units/ogres/great-ogre.png:300"
+        [/frame]
+        {SOUND:HIT_AND_MISS axe.ogg {SOUND_LIST:MISS} -100}
+    [/attack_anim]
+[/unit_type]

data/core/units/ogres/Ogre.cfg

@@ -14,10 +14,10 @@
         mountains=50
     [/defense]
     movement=5
-    experience=100
+    experience=80
     level=2
     alignment=neutral
-    advances_to=null
+    advances_to=Great Ogre
     {AMLA_DEFAULT}
     cost=27
     usage=fighter