Gym Leader Rematches!

This commit adds a large fundamental change to KEP, that being Gym Rematches.

This is achieved alongside a rework to the script that makes those post-game-gating NPCs shift around. If you add a new one, just add its constant to the lists you'll see in the Hall of Fame script.

It also fixes a few bugs:
- Fixed a bug where Cinnabar Gym loaded a fleet of Blaines. This occurred due to the way he is coded at base, and a misunderstanding I had when implementing his scaling. This is now fixed by standardising his gym script instead, while letting the gym trainers still use the old one.
- Fixed a bug where the Up-Grade NPC would not appear after beating Silph Co. 11F. However, Giovanni currently seems to have trouble with his text. This floor needs some re-coding anyway, given we need to add Jessie and James to it.

And some misc. changes:
- Changed the first Moon Stone in Mt. Moon to a Poison Stone for the Nidoking speedrunners
- Debug Mode now has a line of code to set up the post-game easily
- Changed Surge's initial battle text to Yellow's
- Added Sabrina's more accurate LGPE initial battle text, referring to the spoon she bent by accident

text/FuchsiaGym.asm

@@ -24,3 +24,26 @@ _ReceivedSoulBadgeText::
 	para "Here! Take the"
 	line "SOULBADGE!"
 	prompt
+
+_KogaRematchPreBattleText::
+	text "Fwahahaha!"
+	
+	para "If it isn't the"
+	line "child."
+	
+	para "It seems we are"
+	line "fated to meet"
+	cont "once again."
+	
+	para "You have come"
+	line "at a truly"
+	cont "opportune time."
+	
+	para "I wanted to test"
+	line "my newly refined"
+	cont "ninja skills..."
+	
+	para "In a battle that"
+	line "will end in your"
+	cont "utter defeat!"
+	done