Move 'map attributes' into 'layouts'

data/layouts/RusturfTunnel/border.bin

@@ -0,0 +1 @@
+

data/layouts/RusturfTunnel/layout.inc

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+	.align 2
+RusturfTunnel_MapBorder::
+	.incbin "data/layouts/RusturfTunnel/border.bin"
+
+	.align 2
+RusturfTunnel_MapBlockdata::
+	.incbin "data/layouts/RusturfTunnel/map.bin"
+
+	.align 2
+RusturfTunnel_Layout::
+	.4byte 0x24
+	.4byte 0x18
+	.4byte RusturfTunnel_MapBorder
+	.4byte RusturfTunnel_MapBlockdata
+	.4byte gTileset_General
+	.4byte gTileset_RusturfTunnel

data/layouts/RusturfTunnel/map.bin

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+3!43!!!4
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