Move 'map attributes' into 'layouts'

data/layouts/RustboroCity_Gym/layout.inc

@@ -0,0 +1,16 @@
+	.align 2
+RustboroCity_Gym_MapBorder::
+	.incbin "data/layouts/RustboroCity_Gym/border.bin"
+
+	.align 2
+RustboroCity_Gym_MapBlockdata::
+	.incbin "data/layouts/RustboroCity_Gym/map.bin"
+
+	.align 2
+RustboroCity_Gym_Layout::
+	.4byte 0xb
+	.4byte 0x14
+	.4byte RustboroCity_Gym_MapBorder
+	.4byte RustboroCity_Gym_MapBlockdata
+	.4byte gTileset_Building
+	.4byte gTileset_RustboroGym

data/layouts/RustboroCity_Gym/map.bin

@@ -0,0 +1,2 @@
+
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+2262222
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