Removed empty top rows from RA base structure footprints

Removed top row of buildings where it only consisted of _ cells and adjusted the art offset instead. This fixes the issue that CenterPosition was located in the middle between the occupied and passable cell for defenses like tesla coils, makes their placement a bit more intuitive and makes setting up proper HitShapes easier.

mods/ra/sequences/structures.yaml

@@ -131,12 +131,16 @@ powr:
 
 apwr:
 	idle:
+		Offset: 0,-10
 	damaged-idle:
 		Start: 1
+		Offset: 0,-10
 	make: apwrmake
 		Length: *
+		Offset: 0,-10
 	dead: apwrdead
 		Tick: 800
+		Offset: 0,-10
 	bib: bib2
 		Length: *
 		UseTilesetExtension: true
@@ -374,29 +378,29 @@ agun:
 	idle:
 		Facings: 32
 		UseClassicFacingFudge: True
-		Offset: 0,-1
+		Offset: 0,-13
 	recoil:
 		Start: 32
 		Facings: 32
 		UseClassicFacingFudge: True
-		Offset: 0,-1
+		Offset: 0,-13
 	make: agunmake
 		Length: *
-		Offset: 0,-1
+		Offset: 0,-13
 	damaged-idle:
 		Start: 64
 		Facings: 32
 		UseClassicFacingFudge: True
-		Offset: 0,-1
+		Offset: 0,-13
 	damaged-recoil:
 		Start: 96
 		Facings: 32
 		UseClassicFacingFudge: True
-		Offset: 0,-1
+		Offset: 0,-13
 	muzzle: gunfire2
 		Start: 1
 		Length: 4
-		Offset: 0,-1
+		Offset: 0,-13
 	bib: mbAGUN
 		Length: *
 		UseTilesetExtension: true
@@ -441,23 +445,23 @@ ftur:
 
 tsla:
 	idle:
-		Offset: 0,-1
+		Offset: 0,-13
 	damaged-idle:
 		Start: 10
-		Offset: 0,-1
+		Offset: 0,-13
 	make: tslamake
 		Length: *
-		Offset: 0,-1
+		Offset: 0,-13
 	active:
 		Start: 1
 		Length: 9
 		Tick: 100
-		Offset: 0,-1
+		Offset: 0,-13
 	damaged-active:
 		Start: 11
 		Length: 9
 		Tick: 100
-		Offset: 0,-1
+		Offset: 0,-13
 	bib: mbTSLA
 		Length: *
 		UseTilesetExtension: true
@@ -498,14 +502,14 @@ hbox:
 gap:
 	idle:
 		Length: 32
-		Offset: 0,-2
+		Offset: 0,-14
 	damaged-idle:
 		Start: 32
 		Length: 32
-		Offset: 0,-2
+		Offset: 0,-14
 	make: gapmake
 		Length: *
-		Offset: 0,-2
+		Offset: 0,-14
 	bib: mbGAP
 		Length: *
 		UseTilesetExtension: true