cartridge titles in SNES ROM header: verify we're doing the right thing if multi-byte

This is a continuation of #50 (more info there), if the Cartridge Rom header field in the SNES ROM header contains characters that are not one-byte per-character (like some Japanese glyphs are), then we might not always be doing the right thing when encoding/decoding.

We should write a unit test that shows a situation where:

var encoding = Encoding.GetEncoding(932); // 932 is "ShiftJIS"
var str = /*insert string here with multibyte Japanese chars in it*/;
var jisRawBytes = ByteUtil.GetRawShiftJisBytesFromStr(str);
Assert.NotEqual(jisRawBytes.Length, str.Length);

And then given those conditions, check all the other areas of the code to make sure it behaves nicely there. Particularly, paying attention to anything that uses RomUtil.LengthOfTitleName

I was confident enough for the couple ROM headers I tested that I think we have this decently implemented (and definitely for English). and, there is extensive unit testing support for this now. but it would be good to test this final bit of the edge case.

IsoFrieze / DiztinGUIsh

cartridge titles in SNES ROM header: verify we're doing the right thing if multi-byte #51