Cleaned up the palette handling a bit. Renamed _palCopy to _palette since I

found the old name misleading (there is only one array that stores the
palette in the engine, though it could be argued that it's a copy of the
one used by the backend), and removed some code that I'm almost certain was
never used. (I've added assert()s to trigger in the cases where it would
have been used.)

svn-id: r13949

sword2/function.cpp

@@ -433,7 +433,7 @@ int32 Logic::fnPlayCredits(int32 *params) {
 	uint16 logoWidth = 0;
 	uint16 logoHeight = 0;
 	byte *logoData = NULL;
-	byte palette[1024];
+	byte palette[256 * 4];
 
 	if (f.open("credits.bmp")) {
 		logoWidth = f.readUint16LE();