Add descriptions/tooltips to export preset settings

[Calinou]

See also #1339 and #2041.

Describe the project you are working on

The Godot editor 🙂

Describe the problem or limitation you are having in your project

Export preset settings (such as Android permissions or macOS entitlements) can't have descriptions when hovered in the editor. Like for editor settings, tooltips will appear but will be empty:

This often leads to confusion for settings which can have an impact on the final project (such as rcedit not working if the version identifier is not of the form N.N.N.N where N is a non-negative integer).

Describe the feature / enhancement and how it helps to overcome the problem or limitation

When hovering an export setting in an export preset, display a tooltip with documentation.

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

Figure out a way to document export settings in the class reference by exposing them somehow. Maybe expose dummy classes for each export platform so they can be listed in the class reference?

If this enhancement will not be used often, can it be worked around with a few lines of script?

No, as this is core editor/documentation system functionality.

Is there a reason why this should be core and not an add-on in the asset library?

This is core editor/documentation system functionality.

[Calinou]

This was implemented by godotengine/godot#74644, closing.