Move 'map attributes' into 'layouts'

data/layouts/BattleFrontier_BattleArenaLobby/layout.inc

@@ -0,0 +1,16 @@
+	.align 2
+BattleFrontier_BattleArenaLobby_MapBorder::
+	.incbin "data/layouts/BattleFrontier_BattleArenaLobby/border.bin"
+
+	.align 2
+BattleFrontier_BattleArenaLobby_MapBlockdata::
+	.incbin "data/layouts/BattleFrontier_BattleArenaLobby/map.bin"
+
+	.align 2
+BattleFrontier_BattleArenaLobby_Layout::
+	.4byte 0x10
+	.4byte 0xd
+	.4byte BattleFrontier_BattleArenaLobby_MapBorder
+	.4byte BattleFrontier_BattleArenaLobby_MapBlockdata
+	.4byte gTileset_Building
+	.4byte gTileset_BattleArena

data/layouts/BattleFrontier_BattleArenaLobby/map.bin

@@ -0,0 +1,3 @@
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