Move lots of data tables into individual data/ files

(This is not expected to be their final location, but it makes them easier to relocate when necessary, and easier for users to edit until the whole project's file structure is finalized.)

gfx/icon_pointers.asm

@@ -0,0 +1,41 @@
+IconPointers:
+; entries correspond to ICON_* constants
+	dw NullIcon
+	dw PoliwagIcon
+	dw JigglypuffIcon
+	dw DiglettIcon
+	dw PikachuIcon
+	dw StaryuIcon
+	dw FishIcon
+	dw BirdIcon
+	dw MonsterIcon
+	dw ClefairyIcon
+	dw OddishIcon
+	dw BugIcon
+	dw GhostIcon
+	dw LaprasIcon
+	dw HumanshapeIcon
+	dw FoxIcon
+	dw EquineIcon
+	dw ShellIcon
+	dw BlobIcon
+	dw SerpentIcon
+	dw VoltorbIcon
+	dw SquirtleIcon
+	dw BulbasaurIcon
+	dw CharmanderIcon
+	dw CaterpillarIcon
+	dw UnownIcon
+	dw GeodudeIcon
+	dw FighterIcon
+	dw EggIcon
+	dw JellyfishIcon
+	dw MothIcon
+	dw BatIcon
+	dw SnorlaxIcon
+	dw HoOhIcon
+	dw LugiaIcon
+	dw GyaradosIcon
+	dw SlowpokeIcon
+	dw SudowoodoIcon
+	dw BigmonIcon

gfx/icons.asm

@@ -0,0 +1,39 @@
+NullIcon:
+PoliwagIcon:      INCBIN "gfx/icon/poliwag.2bpp" ; 0x8ec0d
+JigglypuffIcon:   INCBIN "gfx/icon/jigglypuff.2bpp" ; 0x8ec8d
+DiglettIcon:      INCBIN "gfx/icon/diglett.2bpp" ; 0x8ed0d
+PikachuIcon:      INCBIN "gfx/icon/pikachu.2bpp" ; 0x8ed8d
+StaryuIcon:       INCBIN "gfx/icon/staryu.2bpp" ; 0x8ee0d
+FishIcon:         INCBIN "gfx/icon/fish.2bpp" ; 0x8ee8d
+BirdIcon:         INCBIN "gfx/icon/bird.2bpp" ; 0x8ef0d
+MonsterIcon:      INCBIN "gfx/icon/monster.2bpp" ; 0x8ef8d
+ClefairyIcon:     INCBIN "gfx/icon/clefairy.2bpp" ; 0x8f00d
+OddishIcon:       INCBIN "gfx/icon/oddish.2bpp" ; 0x8f08d
+BugIcon:          INCBIN "gfx/icon/bug.2bpp" ; 0x8f10d
+GhostIcon:        INCBIN "gfx/icon/ghost.2bpp" ; 0x8f18d
+LaprasIcon:       INCBIN "gfx/icon/lapras.2bpp" ; 0x8f20d
+HumanshapeIcon:   INCBIN "gfx/icon/humanshape.2bpp" ; 0x8f28d
+FoxIcon:          INCBIN "gfx/icon/fox.2bpp" ; 0x8f30d
+EquineIcon:       INCBIN "gfx/icon/equine.2bpp" ; 0x8f38d
+ShellIcon:        INCBIN "gfx/icon/shell.2bpp" ; 0x8f40d
+BlobIcon:         INCBIN "gfx/icon/blob.2bpp" ; 0x8f48d
+SerpentIcon:      INCBIN "gfx/icon/serpent.2bpp" ; 0x8f50d
+VoltorbIcon:      INCBIN "gfx/icon/voltorb.2bpp" ; 0x8f58d
+SquirtleIcon:     INCBIN "gfx/icon/squirtle.2bpp" ; 0x8f60d
+BulbasaurIcon:    INCBIN "gfx/icon/bulbasaur.2bpp" ; 0x8f68d
+CharmanderIcon:   INCBIN "gfx/icon/charmander.2bpp" ; 0x8f70d
+CaterpillarIcon:  INCBIN "gfx/icon/caterpillar.2bpp" ; 0x8f78d
+UnownIcon:        INCBIN "gfx/icon/unown.2bpp" ; 0x8f80d
+GeodudeIcon:      INCBIN "gfx/icon/geodude.2bpp" ; 0x8f88d
+FighterIcon:      INCBIN "gfx/icon/fighter.2bpp" ; 0x8f90d
+EggIcon:          INCBIN "gfx/icon/egg.2bpp" ; 0x8f98d
+JellyfishIcon:    INCBIN "gfx/icon/jellyfish.2bpp" ; 0x8fa0d
+MothIcon:         INCBIN "gfx/icon/moth.2bpp" ; 0x8fa8d
+BatIcon:          INCBIN "gfx/icon/bat.2bpp" ; 0x8fb0d
+SnorlaxIcon:      INCBIN "gfx/icon/snorlax.2bpp" ; 0x8fb8d
+HoOhIcon:         INCBIN "gfx/icon/ho_oh.2bpp" ; 0x8fc0d
+LugiaIcon:        INCBIN "gfx/icon/lugia.2bpp" ; 0x8fc8d
+GyaradosIcon:     INCBIN "gfx/icon/gyarados.2bpp" ; 0x8fd0d
+SlowpokeIcon:     INCBIN "gfx/icon/slowpoke.2bpp" ; 0x8fd8d
+SudowoodoIcon:    INCBIN "gfx/icon/sudowoodo.2bpp" ; 0x8fe0d
+BigmonIcon:       INCBIN "gfx/icon/bigmon.2bpp" ; 0x8fe8d