Integrating JavaScript APIs

[Lecrapouille]

Requested by @punto- https://godotengine.org/article/godot-web-progress-report-9/

[pimhakkert]

I'm curious if there is still interest in something like this. If enough requests are made and some valid examples can be made that can't be solved by a simple Godot <-> JavaScript string transfer, I'll consider working on this.

[Lecrapouille]

@pimhakkert

https://github.com/folgerwang/UnrealEngine/blob/release/Engine/Source/Runtime/WebBrowser/Private/CEF/CEFJSScripting.cpp

https://github.com/folgerwang/UnrealEngine/tree/release/Engine/Source/Runtime/WebBrowser/Private/CEF