Add NUD float UV support

[Dr-HyperCake]

I've added support for a NUD vertex format flag, wherein UV data is stored as floats rather than half-floats. It's used in the Wangan Midnight games. Thanks to @wood5578 for ongoing collaboration; bringing this particular issue to my attention, providing files, and testing changes.

• Added a new polygon attribute, uvType, and a new enum, UVTypes
• Updated the NUD IO code accordingly
  • It also now uses more abstractions, such as the new attributes and enums, rather than magic numbers.
• Fixed a potential issue with the deprecated material attributes, AlphaTest and AlphaFunction, not matching their prior implementation, which could have resulted in erroneous behavior when importing old XMLs.