Move 'map attributes' into 'layouts'

data/layouts/SouthernIsland_Exterior/border.bin

@@ -0,0 +1 @@
+p
p
p
p

data/layouts/SouthernIsland_Exterior/layout.inc

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+	.align 2
+SouthernIsland_Exterior_MapBorder::
+	.incbin "data/layouts/SouthernIsland_Exterior/border.bin"
+
+	.align 2
+SouthernIsland_Exterior_MapBlockdata::
+	.incbin "data/layouts/SouthernIsland_Exterior/map.bin"
+
+	.align 2
+SouthernIsland_Exterior_Layout::
+	.4byte 0x21
+	.4byte 0x1e
+	.4byte SouthernIsland_Exterior_MapBorder
+	.4byte SouthernIsland_Exterior_MapBlockdata
+	.4byte gTileset_General
+	.4byte gTileset_Rustboro

data/layouts/SouthernIsland_Exterior/map.bin

@@ -0,0 +1 @@
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