BUG: Japanese character ShiftJIS encoding not handled correctly in XML serialization

[binary1230]

SNES ROM header supports encoding of Japanese characters in the game title field in ShiftJIS format. However, we're incorectly interpreting these bytes as Unicode.

Diz projects for ROMS with japanese chars in this title field will serialize the incorrect encoding to the XML, and on load, this XML will incorrectly cause Diz to think the name of the cart is different. A verification check will fail and the project will refuse to load.

I have a fix in #49 underway, along with an XML migration that will fix the issue for any affected users.

Technically we don't actually need to store the title in the Project file since we are storing the checksum bytes. However, it's nice to have one extra layer of redundancy so, let's keep it.

The fix adds a lot of extra unit testing and some extra functionality for working with rom titles, checksums, etc. I'm not sure it's comprehensive, but, it appears to work well so far.

(Originally reported by LuigisBlood in SNESLab Discord, thanks!)

[binary1230]

unit test now available showing the bug and mitigating the issue. phew. this ended up being a thing.
https://github.com/Dotsarecool/DiztinGUIsh/blob/fix_cart_title_encoding/Diz.Test/bugs/Bug050_JapaneseText.cs

[binary1230]

fixed in #49