Remove all code from main.asm (some labeled INCBINs, like out-of-context graphics, are still present)

engine/routines/ stores isolated out-of-context routines as individual files. It might be preferable later to append them to their related engine/ files in unique little SECTIONs, relying on the linkerscript to place them appropriately; or some other organization method. In the meantime, they're now easily findable apart from main.asm's other content.

engine/routines/newpokedexentry.asm

@@ -0,0 +1,52 @@
+NewPokedexEntry: ; fb877
+	ld a, [hMapAnims]
+	push af
+	xor a
+	ld [hMapAnims], a
+	call LowVolume
+	call ClearBGPalettes
+	call ClearTileMap
+	call UpdateSprites
+	call ClearSprites
+	ld a, [wPokedexStatus]
+	push af
+	ld a, [hSCX]
+	add $5
+	ld [hSCX], a
+	xor a
+	ld [wPokedexStatus], a
+	farcall _NewPokedexEntry
+	call WaitPressAorB_BlinkCursor
+	ld a, $1
+	ld [wPokedexStatus], a
+	farcall DisplayDexEntry
+	call WaitPressAorB_BlinkCursor
+	pop af
+	ld [wPokedexStatus], a
+	call MaxVolume
+	call RotateThreePalettesRight
+	ld a, [hSCX]
+	add -5 ; 251 ; NUM_POKEMON
+	ld [hSCX], a
+	call .ReturnFromDexRegistration
+	pop af
+	ld [hMapAnims], a
+	ret
+; fb8c8
+
+.ReturnFromDexRegistration: ; fb8c8
+	call ClearTileMap
+	call LoadFontsExtra
+	call LoadStandardFont
+	farcall Pokedex_PlaceFrontpicTopLeftCorner
+	call WaitBGMap2
+	farcall GetEnemyMonDVs
+	ld a, [hli]
+	ld [TempMonDVs], a
+	ld a, [hl]
+	ld [TempMonDVs + 1], a
+	ld b, SCGB_TRAINER_OR_MON_FRONTPIC_PALS
+	call GetSGBLayout
+	call SetPalettes
+	ret
+; fb8f1