Add GDScript reference to the Editor

[miv391]

By GDScript reference I mean the documentation about how the basic building blocks of the language work. The reference is already in Internet: https://docs.godotengine.org/en/stable/tutorials/scripting/gdscript/gdscript_basics.html and it is very good.

However, it would be nice to have the reference in the Editor itself as a part of the documentation. Even an experienced programmer sometimes need answers to questions like this:

• What is the syntax of enum?
• How does static keyword work?
• How to call function from a base class?

So it would be great to find the answers by clicking Ctrl + LMB as easily as you can get documentation about print function. The keywords (if, else, ...) should also be present in the Help (opened by F1).

Also when working offline having the GDScript reference built in would be nice.

[Mickeon]

There's already a proposal for this, and a corresponding PR:

• Searching help for keywords / operators / built-in types should bring up a page about the term as the first result #2361
• Add built-in GDScript keywords to the class reference godot#97196