Cinnabar Volcano floors

This adds a map for Cinnabar Volcano's floors in the run-up to Moltres. I used a S.S. Anne style compression technique here, having 4 floors on a decently sized map that are just far enough apart for a player to never actually see them. This maintains their suspension of disbelief while giving us way more space to work with. I want to compress a lot of RBY maps like this if push comes to shove - there's a lot of places where this is possible.

In the interests of compression, I started using the Agatha bank again, as I removed a lot of maps from there when making bank 22. There's some space for maps.

Also I made 3 more blocks for cavern which caused it to overflow the bank it was in - fixed that by swapping with PreGym, which is probably much smaller.

Cinnabar Volcano hasn't been changed yet in the interest of Martha finishing that bit up.

data/wild/grass_water.asm

@@ -248,6 +248,7 @@ WildDataPointers:
 	dw NothingWildMons
 	dw NothingWildMons
 	dw NothingWildMons
+	dw CinnabarVolcanoFloorsWildMons
 	assert_table_length NUM_MAPS
 	dw -1 ; end
 
@@ -338,3 +339,4 @@ INCLUDE "data/wild/maps/BrunswickTrail.asm"
 INCLUDE "data/wild/maps/GarnetCavern1F.asm"
 INCLUDE "data/wild/maps/GarnetCavernB1F.asm"
 INCLUDE "data/wild/maps/GarnetCavern2F.asm"
+INCLUDE "data/wild/maps/CinnabarVolcanoFloors.asm"

data/wild/maps/CinnabarVolcanoFloors.asm

@@ -0,0 +1,16 @@
+CinnabarVolcanoFloorsWildMons:
+	def_grass_wildmons 10 ; encounter rate
+	db 37, VULPIX
+	db 38, PONYTA
+	db 37, GROWLITHE
+	db 37, PONYTA
+	db 38, GROWLITHE
+	db 41, RAPIDASH
+	db 33, CHARMANDER
+	db 38, MAGMAR
+	db 39, MAGMAR
+	db 40, CHARMELEON
+	end_grass_wildmons
+
+	def_water_wildmons 0 ; encounter rate
+	end_water_wildmons