Use open- and close-double quotes instead of neutral single quotes.

James Sanders was listed twice.

stepmania/src/ScreenCredits.cpp

@@ -67,37 +67,36 @@ const CreditLine CREDIT_LINES[] =
 	{0,"DJ McFox (Ryan McKanna)"},
 	{0,"Cloud34 (Lamden Travis)"},
 	{0,"Redcrusher (Michael Curry)"},
-	{0,"Steve 'healing_vision' Klise"},
+	{0,"Steve “healing_vision” Klise"},
 	{0,"Mauro Panichella"},
 	{0,"Griever (Julian)"},
 	{0,"Miguel Moore"},
-	{0,"Dj 'AeON ExOdus' Washington"},
+	{0,"Dj “AeON ExOdus” Washington"},
 	{0,"Xelf"},
-	{0,"SPDS (James Sanders)"},
+	{0,"James “SPDS” Sanders"},
 	{0,"k0ldx"},
 	{0,""},
 	{0,""},
 	{0,""},
 	{2,"☆☆WEB DESIGN☆☆"},
-	{0,"Brian 'Bork' Bugh"},
+	{0,"Brian “Bork” Bugh"},
 	{0,""},
 	{0,""},
 	{0,""},
 	{2,"☆☆SOUND☆☆"},
-	{0,"Kyle 'KeeL' Ward"},
-	{0,"Jim 'Izlude' Cabeen"},
+	{0,"Kyle “KeeL” Ward"},
+	{0,"Jim “Izlude” Cabeen"},
 	{0,""},
 	{0,""},
 	{0,""},
 	{2,"☆☆TESTING☆☆"},
 	{0,"Gotetsu"},
-	{0,"spds (James Sanders)"},
 	{0,""},
 	{0,""},
 	{0,""},
 	{2,"☆☆PROGRAMMING☆☆"},
 	{0,"Chris Danford"},
-	{0,"Andrew 'Frieza' Livy"},
+	{0,"Andrew “Frieza” Livy"},
 	{0,"Glenn Maynard"},
 	{0,"Bruno Figueiredo"},
 	{0,"Dro Kulix (Peter S. May)"},
@@ -110,7 +109,7 @@ const CreditLine CREDIT_LINES[] =
 	{0,"dirkthedaring (Michael Patterson)"},
 	{0,"angedelamort (Sauleil Lamarre)"},
 	{0,"Edwin Evans"},
-	{0,"Brian 'Bork' Bugh"},
+	{0,"Brian “Bork” Bugh"},
 	{0,"Elvis314 (Joel Maher)"},
 	{0,"Kefabi (Garth Smith)"},
 	{0,"Pkillah (Playah Killah)"},
@@ -141,8 +140,8 @@ const CreditLine CREDIT_LINES[] =
 	{0,"Lagged"},
 	{0,"The Melting Pot"},
 	{0,"DDRJamz Global BBS"},
-	{0,"Eric 'WaffleKing' Webster"},
-	{0,"Mark 'Foobly' Verrey"},
+	{0,"Eric “WaffleKing” Webster"},
+	{0,"Mark “Foobly” Verrey"},
 	{0,"Mandarin Blue"},
 	{0,"Anne Kiel"},
 	{0,"BeMaNiFiNiNaTiC (Jeremy Hine)"},