Add create folder button to project imports

[likeich]

Describe the project you are working on

Various projects downloaded from Git.

Describe the problem or limitation you are having in your project

Importing projects from a zip or project file in the import menu of the project manager requires users to create an empty folder outside of the godot editor. This adds extra time that can build up while checking out many different projects.

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

Add a "Create Folder" button to the import existing project menu that will parse the name of the file to import and create a folder for it in the same way as creating a new project gives you the option to create a folder.

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

These are screenshots from a branch I have where this feature is implemented.

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

It requires engine changes.

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

It's an editor-specific function.