remove unused terrain from UtBS...

...and place images in images/scenery so anyone can use them

data/campaigns/Under_the_Burning_Suns/utils/terrain.cfg

@@ -55,27 +55,3 @@
     no_overlay=true
     editor_group=utbs
 [/terrain_type]
-
-[terrain_type]
-    symbol_image=summoning-center
-    id=summoning_circle_inner
-    name= _ "Inner Summoning Circle"
-    string=^Sci
-    aliasof=_bas
-    heals=8
-    recruit_from=true
-    no_overlay=true
-    editor_group=utbs
-[/terrain_type]
-
-[terrain_type]
-    symbol_image=summoning-circle6
-    id=summoning_circle_outer
-    name= _ "Outer Summoning Circle"
-    string=^Sco
-    aliasof=_bas
-    heals=0
-    recruit_onto=true
-    no_overlay=true
-    editor_group=utbs
-[/terrain_type]

data/campaigns/Under_the_Burning_Suns/utils/terrain_graphics.cfg

@@ -11,14 +11,6 @@
 {WALL_TRANSITION2    (Dd^Cd,Dd^Kd)  Xu     (!,Dd^Cd,Dd^Kd,Xu)    castle/dwarven-castle-wall}
 {WALL_TRANSITION     (Dd^Cd,Dd^Kd)  (!,Xu,Qxu,Ql,Dd^Cd,Dd^Kd)    castle/dwarven-castle}
 
-{OVERLAY    *^Sci           summoning-center}
-{OVERLAY_P  *^Sco   15      summoning-circle1}
-{OVERLAY_P  *^Sco   15      summoning-circle2}
-{OVERLAY_P  *^Sco   15      summoning-circle3}
-{OVERLAY_P  *^Sco   15      summoning-circle4}
-{OVERLAY_P  *^Sco   15      summoning-circle6}
-{OVERLAY    *^Sco           summoning-circle5}
-
 #ifndef EDITOR
 # This makes gray shallow water transition on top of the wooden floor, which
 # otherwise would have a hard edge; the color-shift values aren't spot-on