Harmonize engine/{movie, pokemon} with pokegold (renames GetSRAMBank to OpenSRAM)

To do: engine/{menus, overworld}

engine/link/link.asm

@@ -835,7 +835,7 @@ Link_PrepPartyData_Gen2:
 
 ; Copy all the mail messages to wc9f9
 	ld a, BANK(sPartyMail)
-	call GetSRAMBank
+	call OpenSRAM
 	ld hl, sPartyMail
 	ld b, PARTY_LENGTH
 .loop2
@@ -1706,7 +1706,7 @@ LinkTrade:
 	ld bc, MAIL_STRUCT_LENGTH
 	call AddNTimes
 	ld a, BANK(sPartyMail)
-	call GetSRAMBank
+	call OpenSRAM
 	ld d, h
 	ld e, l
 	ld bc, MAIL_STRUCT_LENGTH
@@ -2508,7 +2508,7 @@ INCBIN "gfx/trade/unused_gs_border_tiles.2bpp"
 
 Unreferenced_Function29fe4:
 	ld a, BANK(sPartyMail)
-	call GetSRAMBank
+	call OpenSRAM
 	ld d, FALSE
 	ld b, CHECK_FLAG
 	predef SmallFarFlagAction

engine/link/mystery_gift.asm

@@ -1202,14 +1202,14 @@ MysteryGift_ClearTrainerData:
 
 GetMysteryGiftBank:
 	ld a, BANK(sBackupMysteryGiftItem)
-	jp GetSRAMBank
+	jp OpenSRAM
 
 StagePartyDataForMysteryGift:
 ; You will be sending this data to your mystery gift partner.
 ; Structure is the same as a trainer with species and moves
 ; defined.
 	ld a, BANK(sPokemonData)
-	call GetSRAMBank
+	call OpenSRAM
 	ld de, wMysteryGiftStaging
 	ld bc, sPokemonData + wPartyMons - wPokemonData
 	ld hl, sPokemonData + wPartySpecies - wPokemonData
@@ -1521,7 +1521,7 @@ Function105777:
 Function10578c:
 	ld de, wLinkData
 	ld a, BANK(sPlayerData)
-	call GetSRAMBank
+	call OpenSRAM
 	ld hl, sPlayerData + wPlayerName - wPlayerData
 	ld bc, NAME_LENGTH
 	call CopyBytes
@@ -1533,12 +1533,12 @@ Function10578c:
 	call CopyBytes
 	call CloseSRAM
 	ld a, BANK(sCrystalData)
-	call GetSRAMBank
+	call OpenSRAM
 	ld a, [sCrystalData + 0]
 	ld [de], a
 	inc de
 	ld a, BANK(s4_a603) ; aka BANK(s4_a007) ; MBC30 bank used by JP Crystal; inaccessible by MBC3
-	call GetSRAMBank
+	call OpenSRAM
 	ld hl, s4_a603 ; address of MBC30 bank
 	ld bc, $8
 	call CopyBytes

engine/link/mystery_gift_2.asm

@@ -4,7 +4,7 @@ PrepMysteryGiftDataToSend:
 	ld [de], a
 	inc de ; wc801
 	ld a, BANK(sGameData)
-	call GetSRAMBank
+	call OpenSRAM
 	ld hl, sPlayerData + wPlayerID - wPlayerData
 	ld a, [hli]
 	ld [de], a
@@ -42,7 +42,7 @@ PrepMysteryGiftDataToSend:
 	ld [de], a
 	inc de ; wc812
 	ld a, BANK(sBackupMysteryGiftItem)
-	call GetSRAMBank
+	call OpenSRAM
 	ld a, [sBackupMysteryGiftItem]
 	ld [de], a
 	inc de