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

data/maps/objects/RedsHouse2F.asm

@@ -7,7 +7,8 @@ RedsHouse2F_Object:
 	;warp_event  5,  1, SILPH_CO_11F, 1 ; - Test Omega & Giovanni
 	;warp_event  5,  1, ROCKET_HIDEOUT_B4F, 2 ; - Test Giovanni 1
 	;warp_event  5,  1, MT_MOON_SQUARE, 1 ; - Test Shop, NPCs, and Crater
-	warp_event  5,  1, CELESTE_HILL, 2 ; - Test Birds
+	;warp_event  5,  1, CELESTE_HILL, 2 ; - Test Birds
+	warp_event	 5,  1, INDIGO_PLATEAU_LOBBY, 1 ; easy league access
 
 	def_bg_events