Move 'map attributes' into 'layouts'

data/layouts/SeafloorCavern_Room3/border.bin

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+����

data/layouts/SeafloorCavern_Room3/layout.inc

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+	.align 2
+SeafloorCavern_Room3_MapBorder::
+	.incbin "data/layouts/SeafloorCavern_Room3/border.bin"
+
+	.align 2
+SeafloorCavern_Room3_MapBlockdata::
+	.incbin "data/layouts/SeafloorCavern_Room3/map.bin"
+
+	.align 2
+SeafloorCavern_Room3_Layout::
+	.4byte 0x10
+	.4byte 0x11
+	.4byte SeafloorCavern_Room3_MapBorder
+	.4byte SeafloorCavern_Room3_MapBlockdata
+	.4byte gTileset_General
+	.4byte gTileset_Cave

data/layouts/SeafloorCavern_Room3/map.bin

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