Expanding on Pokemon icon usage

This adds Pikachu, Cat, and "Small Bird" menu icons. The cat has a custom animation done by myself.

The Jigglypuff in the Pokemon Centre now uses the new sprite, nice 'n' pretty. Officer Jenny is also in Cerulean. The Pokemon from Melanie's house in Yellow have been put in Mr. Fuji's House, given the purpose of the house in RB is different. I think it ends up fitting very nicely.

Chansey has been given its proper sprite in Fuschia. Yellow didn't actually do this, as Chansey doesn't have a walk cycle, causing the stuff that exists to go unused. I wanted it, though, so I had Chansey just not walk and turn around. Oh, and it's in all the Pokemon Centres now. Yeah, that's a...lot of changed files.

constants/icon_constants.asm

@@ -1,3 +1,4 @@
+; Backported from Yellow
 ; party menu icons
 ; used in MonPartySpritePointers (see data/icon_pointers.asm)
 	const_def
@@ -11,7 +12,10 @@
 	const ICON_GRASS     ; $7
 	const ICON_SNAKE     ; $8
 	const ICON_QUADRUPED ; $9
+	const ICON_PIKACHU   ; $A
+	const ICON_SMALL_BIRD; $0B
+	const ICON_CAT 		 ; 0C
 
-DEF ICON_TRADEBUBBLE EQU $e
+DEF ICON_TRADEBUBBLE EQU $0e
 
 DEF ICONOFFSET EQU $40 ; difference between alternating icon frames' tile IDs

constants/sprite_constants.asm

@@ -74,6 +74,7 @@
 	const SPRITE_JESSIE                  ; $45
 	const SPRITE_JAMES                   ; $46
 	const SPRITE_CAT
+	const SPRITE_SMALL_BIRD
 DEF FIRST_STILL_SPRITE EQU const_value
 	const SPRITE_POKE_BALL               ; $47
 	const SPRITE_FOSSIL                  ; $48