Moving chocobone to the default units

(because it's used by three mainline campaigns), part #1.

data/units/Undead_Skele_Chocobone.cfg

@@ -0,0 +1,79 @@
+[unit]
+	id=Chocobone
+	name= _ "Chocobone"
+	race=undead
+	image="units/undead-skeletal/chocobone.png"
+	hitpoints=45
+	movement_type=undeadfoot
+	movement=9
+	experience=100
+	level=2
+	alignment=chaotic
+	advanceto=null
+	{AMLA_TOUGH 3}
+	[abilities]
+		{ABILITY_SUBMERGE}
+	[/abilities]
+	cost=38
+	usage=scout
+	unit_description= _ "Riding the bones of ostrich-like large birds once used as mounts by a lost civilization, the skeletal Chocobones can move faster than most cavalry units."
+	die_sound=wail-long.wav
+	{DEFENSE_ANIM "units/undead-skeletal/chocobone-defend.png" "units/undead-skeletal/chocobone.png" skeleton-hit.wav }
+	[attack]
+		name=spear
+		type=pierce
+		range=melee
+		[specials]
+			{WEAPON_SPECIAL_CHARGE}
+		[/specials]
+		damage=9
+		number=2
+		[animation]
+			hits=yes
+			[frame]
+				begin=-200
+				end=-100
+				image="units/undead-skeletal/chocobone-moving.png"
+			[/frame]
+			[frame]
+				begin=-100
+				end=150
+				image="units/undead-skeletal/chocobone-attack.png"
+				sound=spear.ogg
+			[/frame]
+		[/animation]
+		[animation]
+			hits=no
+			[frame]
+				begin=-200
+				end=-100
+				image="units/undead-skeletal/chocobone-moving.png"
+			[/frame]
+			[frame]
+				begin=-100
+				end=150
+				image="units/undead-skeletal/chocobone-attack.png"
+				sound=spear-miss.ogg
+			[/frame]
+		[/animation]
+	[/attack]
+	[movement_anim]
+		[frame]
+			begin=0
+			end=150
+			image="units/undead-skeletal/chocobone-moving.png"
+		[/frame]
+	[/movement_anim]
+	[death]
+		[frame]
+			begin=0
+			end=200
+			image="units/undead-skeletal/chocobone-die-1.png"
+		[/frame]
+		[frame]
+			begin=200
+			end=400
+			image="units/undead-skeletal/chocobone-die-2.png"
+		[/frame]
+	[/death]
+[/unit]