Implement alternative IStaticEncoding provider

[Soreepeong]

Since CodePagesEncodingProvider.Instance.GetEncoding(0) fails for some people, implemented a custom version using Windows APIs.

[github-actions[bot]]

Breaking Changes

Member exists in left but not in right

: 1

: 2

• FFXIVClientStructs.STD.Helper.IStaticEncoding.System.System() .
• FFXIVClientStructs.STD.Helper.IStaticEncoding.Unicode.Unicode() .

Type has changed sealed/non-sealed status

Global: 2

• FFXIVClientStructs.STD.Helper.IStaticEncoding.System has the sealed modifier
• FFXIVClientStructs.STD.Helper.IStaticEncoding.Unicode has the sealed modifier