Move 'map attributes' into 'layouts'

data/maps/GraniteCave_StevensRoom/border.bin

@@ -1 +0,0 @@
-

data/maps/GraniteCave_StevensRoom/header.inc

@@ -1,5 +1,5 @@
 GraniteCave_StevensRoom: @ 8483FD8
-	.4byte GraniteCave_StevensRoom_MapAttributes
+	.4byte GraniteCave_StevensRoom_Layout
 	.4byte GraniteCave_StevensRoom_MapEvents
 	.4byte GraniteCave_StevensRoom_MapScripts
 	.4byte 0x0

data/maps/GraniteCave_StevensRoom/map.bin

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