Organize macros/ like pokecrystal

While doing so I replaced the StopAllMusic macro with a SFX_STOP_ALL_MUSIC constant and applied it throughout the code.

engine/movie/credits.asm

@@ -21,7 +21,7 @@ HallOfFamePC:
 	ld a, %11000000
 	ld [rBGP], a
 	call EnableLCD
-	ld a, $ff
+	ld a, SFX_STOP_ALL_MUSIC
 	call PlaySoundWaitForCurrent
 	ld c, BANK(Music_Credits)
 	ld a, MUSIC_CREDITS

engine/movie/evolution.asm

@@ -9,7 +9,7 @@ EvolveMon:
 	xor a
 	ld [wLowHealthAlarm], a
 	ld [wChannelSoundIDs + Ch5], a
-	dec a
+	dec a ; SFX_STOP_ALL_MUSIC
 	ld [wNewSoundID], a
 	call PlaySound
 	ld a, $1
@@ -67,7 +67,7 @@ EvolveMon:
 	ld a, [wEvoNewSpecies]
 .done
 	ld [wWholeScreenPaletteMonSpecies], a
-	ld a, $ff
+	ld a, SFX_STOP_ALL_MUSIC
 	ld [wNewSoundID], a
 	call PlaySound
 	ld a, [wWholeScreenPaletteMonSpecies]

engine/movie/oak_speech/oak_speech.asm

@@ -32,8 +32,8 @@ SetDefaultNames:
 	jp CopyData
 
 OakSpeech:
-	ld a, $FF
-	call PlaySound ; stop music
+	ld a, SFX_STOP_ALL_MUSIC
+	call PlaySound
 	ld a, BANK(Music_Routes2)
 	ld c, a
 	ld a, MUSIC_ROUTES2
@@ -133,9 +133,9 @@ OakSpeech:
 	ld [wAudioSavedROMBank], a
 	ld a, 10
 	ld [wAudioFadeOutControl], a
-	ld a, $FF
+	ld a, SFX_STOP_ALL_MUSIC
 	ld [wNewSoundID], a
-	call PlaySound ; stop music
+	call PlaySound
 	pop af
 	ld [H_LOADEDROMBANK], a
 	ld [MBC1RomBank], a