Add subdirectories to data/ similar to pokecrystal

Top level text/ is now solely for the former text/maps/ files, and other files are in their respective subdirectories in data/.

text/Route18.asm

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+_Route18BattleText1::
+	text "I always check"
+	line "every grassy area"
+	cont "for new #MON."
+	done
+
+_Route18EndBattleText1::
+	text "Tch!"
+	prompt
+
+_Route18AfterBattleText1::
+	text "I wish I had a"
+	line "BIKE!"
+	done
+
+_Route18BattleText2::
+	text "Kurukkoo!"
+	line "How do you like"
+	cont "my bird call?"
+	done
+
+_Route18EndBattleText2::
+	text "I"
+	line "had to bug you!"
+	prompt
+
+_Route18AfterBattleText2::
+	text "I also collect sea"
+	line "#MON on"
+	cont "weekends!"
+	done
+
+_Route18BattleText3::
+	text "This is my turf!"
+	line "Get out of here!"
+	done
+
+_Route18EndBattleText3::
+	text "Darn!"
+	prompt
+
+_Route18AfterBattleText3::
+	text "This is my fave"
+	line "#MON hunting"
+	cont "area!"
+	done
+
+_Route18Text4::
+	text "ROUTE 18"
+	line "CELADON CITY -"
+	cont "FUCHSIA CITY"
+	done
+
+_Route18Text5::
+	text "CYCLING ROAD"
+	line "No pedestrians"
+	cont "permitted!"
+	done