Consistent insensitive string comparisons.

This seems to reduce the need for a #define,
but I need someone on the Windows side to check.

src/NotesLoaderKSF.cpp

@@ -286,12 +286,12 @@ static void LoadTags( const RString &str, Song &out )
 	split( str, " - ", asBits, false );
 	// Ignore the difficulty, since we get that elsewhere.
 	if( asBits.size() == 3 && (
-		!stricmp(asBits[2], "double") ||
-		!stricmp(asBits[2], "easy") ||
-		!stricmp(asBits[2], "normal") ||
-		!stricmp(asBits[2], "hard") ||
-		!stricmp(asBits[2], "crazy") ||
-		!stricmp(asBits[2], "nightmare")) 
+		asBits[2].EqualsNoCase("double") ||
+		asBits[2].EqualsNoCase("easy") ||
+		asBits[2].EqualsNoCase("normal") ||
+		asBits[2].EqualsNoCase("hard") ||
+		asBits[2].EqualsNoCase("crazy") ||
+		asBits[2].EqualsNoCase("nightmare")) 
 		)
 	{
 		asBits.erase( asBits.begin()+2, asBits.begin()+3 );