Document, cleanup, extract data from trade

sym_ewram.txt

@@ -111,25 +111,7 @@ gUnknown_02022D00: @ 2022D00
 	.include "src/random.o"
 	.include "src/daycare.o"
 	.include "src/load_save.o"
-
-gUnknown_02032184: @ 2032184
-	.space 0x4
-
-gUnknown_02032188: @ 2032188
-	.space 0x38
-
-gUnknown_020321C0: @ 20321C0
-	.space 0xD8
-
-gUnknown_02032298: @ 2032298
-	.space 0x4
-
-gUnknown_0203229C: @ 203229C
-	.space 0x4
-
-gUnknown_020322A0: @ 20322A0
-	.space 0x4
-	
+	.include "src/trade.o"
 	.include "src/berry_blender.o"
 	.include "src/new_game.o"
 	.include "src/overworld.o"
@@ -138,11 +120,6 @@ gUnknown_020322A0: @ 20322A0
 	.include "src/field_player_avatar.o"
 	.include "src/event_object_movement.o"
 	.include "src/field_message_box.o"
-
-	.align 2
-gUnknown_020375C0: @ 20375C0
-	.space 0x4
-
 	.include "src/scrcmd.o"
 	.include "src/field_control_avatar.o"
 	.include "src/event_data.o"
@@ -152,7 +129,7 @@ gUnknown_020375C0: @ 20375C0
 	.include "src/sound.o"
 	.include "src/battle_anim.o"
 	.include "src/battle_anim_80A5C6C.o"
-	
+
 	.space 0xC
 	.include "src/field_weather.o"
 	.include "src/field_weather_effect.o"