Fix snake_case filenames

Renamed a bunch of files, most of them one-off functions, to better fit
the general snake_case naming scheme. Also renamed some awfully long filenames.

engine/pokedex/new_pokedex_entry.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 POKEDEX_SCX
+	ld [hSCX], a
+	xor a
+	ld [wPokedexStatus], a
+	farcall _NewPokedexEntry
+	call WaitPressAorB_BlinkCursor
+	ld a, 1 ; page 2
+	ld [wPokedexStatus], a
+	farcall DisplayDexEntry
+	call WaitPressAorB_BlinkCursor
+	pop af
+	ld [wPokedexStatus], a
+	call MaxVolume
+	call RotateThreePalettesRight
+	ld a, [hSCX]
+	add -POKEDEX_SCX
+	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 [wTempMonDVs], a
+	ld a, [hl]
+	ld [wTempMonDVs + 1], a
+	ld b, SCGB_TRAINER_OR_MON_FRONTPIC_PALS
+	call GetSGBLayout
+	call SetPalettes
+	ret
+; fb8f1