Move 'map attributes' into 'layouts'

data/layouts/GraniteCave_StevensRoom/border.bin

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+

data/layouts/GraniteCave_StevensRoom/layout.inc

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+	.align 2
+GraniteCave_StevensRoom_MapBorder::
+	.incbin "data/layouts/GraniteCave_StevensRoom/border.bin"
+
+	.align 2
+GraniteCave_StevensRoom_MapBlockdata::
+	.incbin "data/layouts/GraniteCave_StevensRoom/map.bin"
+
+	.align 2
+GraniteCave_StevensRoom_Layout::
+	.4byte 0xf
+	.4byte 0xe
+	.4byte GraniteCave_StevensRoom_MapBorder
+	.4byte GraniteCave_StevensRoom_MapBlockdata
+	.4byte gTileset_General
+	.4byte gTileset_Cave

data/layouts/GraniteCave_StevensRoom/map.bin

@@ -0,0 +1,4 @@
+
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2$!
+
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2$
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2$
+$!!!!!$$!!!!!!!!$$!!!!!!!!!!$