Split map scripts, text, events from main.asm

The commit we deserve

maps/SilverCaveRoom3.asm

@@ -0,0 +1,70 @@
+SilverCaveRoom3_MapScriptHeader: ; 0x18c601
+	; trigger count
+	db 0
+
+	; callback count
+	db 0
+; 0x18c603
+
+UnknownScript_0x18c603: ; 0x18c603
+	special $006a
+	faceplayer
+	loadfont
+	2writetext UnknownText_0x18c637
+	closetext
+	loadmovesprites
+	winlosstext UnknownText_0x18c63c, UnknownText_0x18c63c
+	loadtrainer RED, 1
+	startbattle
+	reloadmapmusic
+	returnafterbattle
+	special $006a
+	loadfont
+	2writetext UnknownText_0x18c63f
+	closetext
+	loadmovesprites
+	special $0030
+	special $0033
+	disappear $2
+	pause 15
+	special $0032
+	pause 30
+	special $001b
+	refreshscreen $0
+	credits
+	end
+; 0x18c637
+
+UnknownText_0x18c637: ; 0x18c637
+	db $0, $56, $4f
+	db $56, $57
+; 0x18c63c
+
+UnknownText_0x18c63c: ; 0x18c63c
+	db $0, "…", $57
+; 0x18c63f
+
+UnknownText_0x18c63f: ; 0x18c63f
+	db $0, $56, $4f
+	db $56, $57
+; 0x18c644
+
+SilverCaveRoom3_MapEventHeader: ; 0x18c644
+	; filler
+	db 0, 0
+
+	; warps
+	db 1
+	warp_def $21, $9, 2, GROUP_SILVER_CAVE_ROOM_2, MAP_SILVER_CAVE_ROOM_2
+
+	; xy triggers
+	db 0
+
+	; signposts
+	db 0
+
+	; people-events
+	db 1
+	person_event $6, 14, 13, $7, $0, 255, 255, $80, 0, UnknownScript_0x18c603, $0762
+; 0x18c65c
+