- migrate a large part of the sound code to FSoundIDs.

This has always been a wild mixture of IDs and ints.

src/gamedata/gi.cpp

@@ -156,7 +156,7 @@ const char* GameInfoBorders[] =
 			{ \
 				sc.ScriptError("Value for '%s' can not be longer than %d characters.", #key, length); \
 			} \
-			gameinfo.key[gameinfo.key.Reserve(1)] = FSoundID(sc.String); \
+			gameinfo.key[gameinfo.key.Reserve(1)] = S_FindSound(sc.String); \
 		} \
 		while (sc.CheckToken(',')); \
 	}