Last dfmod support for 1.2

[KABoissonneault]

I'm making one issue for a list of all modding features that still only support "loose files" and not .dfmod. I'd like to clear them completely for 1.2. Feel free to add features in a reply below.

• BIOGs (for localization)
• Namegen.txt

[KABoissonneault]

I can't pinpoint exactly where yet, but the XMLManager is pretty still loose file minded.
Functions like XMLManager.XmlFileExists and the path-based constructor only support loose files, making some systems only work with loose files. We should probably rework all of those to use the package-friendly XMLManager.TryReadXml

We have a mod having issues with crosshair replacement, for example. HUDCrosshair uses DaggerfallUI.GetTextureFromResources, which uses TextureReplacement.TryGetSize, which uses XMLManager.XmlFileExists, which only supports loose files.