Rename dt and dd to bigdt and bigdd (#1141)

This makes their big-endianness obvious and matches `bigdw`

engine/events/mom.asm

@@ -552,26 +552,15 @@ Mom_WithdrawDepositMenuJoypad:
 	ret
 
 .DigitQuantities:
-	dt 100000
-	dt 10000
-	dt 1000
-	dt 100
-	dt 10
-	dt 1
-
-	dt 100000
-	dt 10000
-	dt 1000
-	dt 100
-	dt 10
-	dt 1
-
-	dt 900000
-	dt 90000
-	dt 9000
-	dt 900
-	dt 90
-	dt 9
+	for x, 5, -1, -1
+		bigdt 10**x
+	endr
+	for x, 5, -1, -1
+		bigdt 10**x
+	endr
+	for x, 5, -1, -1
+		bigdt 9 * 10**x
+	endr
 
 MomLeavingText1:
 	text_far _MomLeavingText1

engine/events/mom_phone.asm

@@ -228,7 +228,6 @@ MomItsInYourRoomText:
 	text_far _MomItsInYourRoomText
 	text_end
 
-
 DummyPredef3A_DummyData: ; unreferenced
 	db 0
 

engine/events/money.asm

@@ -23,7 +23,7 @@ GiveMoney::
 	ret
 
 MaxMoney:
-	dt MAX_MONEY
+	bigdt MAX_MONEY
 
 TakeMoney::
 	ld a, 3