Move 'map attributes' into 'layouts'

data/layouts/ShoalCave_LowTideLowerRoom/border.bin

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+

data/layouts/ShoalCave_LowTideLowerRoom/layout.inc

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+	.align 2
+ShoalCave_LowTideLowerRoom_MapBorder::
+	.incbin "data/layouts/ShoalCave_LowTideLowerRoom/border.bin"
+
+	.align 2
+ShoalCave_LowTideLowerRoom_MapBlockdata::
+	.incbin "data/layouts/ShoalCave_LowTideLowerRoom/map.bin"
+
+	.align 2
+ShoalCave_LowTideLowerRoom_Layout::
+	.4byte 0x1f
+	.4byte 0xe
+	.4byte ShoalCave_LowTideLowerRoom_MapBorder
+	.4byte ShoalCave_LowTideLowerRoom_MapBlockdata
+	.4byte gTileset_General
+	.4byte gTileset_Cave

data/layouts/ShoalCave_LowTideLowerRoom/map.bin

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+
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