Move 'map attributes' into 'layouts'

data/layouts/PetalburgCity_Gym/border.bin

@@ -0,0 +1 @@
+

data/layouts/PetalburgCity_Gym/layout.inc

@@ -0,0 +1,16 @@
+	.align 2
+PetalburgCity_Gym_MapBorder::
+	.incbin "data/layouts/PetalburgCity_Gym/border.bin"
+
+	.align 2
+PetalburgCity_Gym_MapBlockdata::
+	.incbin "data/layouts/PetalburgCity_Gym/map.bin"
+
+	.align 2
+PetalburgCity_Gym_Layout::
+	.4byte 0x9
+	.4byte 0x70
+	.4byte PetalburgCity_Gym_MapBorder
+	.4byte PetalburgCity_Gym_MapBlockdata
+	.4byte gTileset_Building
+	.4byte gTileset_PetalburgGym

data/layouts/PetalburgCity_Gym/map.bin

@@ -0,0 +1,10 @@
+()()
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