Add Chromium Embedded Framework

[PARTOVIY]

Interface developers for Unturned are severely limited by the inability to add Unity Script to their interfaces.
I think this problem can be solved by adding CEF support.

https://cefsharp.github.io/

[GazziFX]

Look at #1950

[GazziFX]

https://ultralig.ht/
An alternative embedding framework aimed at game engines.

P.S. it doesn't have official Unity integration.
UI ToolKit and client-side uScript should fit better