Add option to directly create favourited resource types from the right click menu in the FileSystem

[Arnklit]

Artists working in Godot often find themselves creating a lot of resources and it would be useful to make it less cumbersome.

One idea could be to add the favourited resources straight into the FileSystem right click menu.

Note this could probably be done as an addon, but it might make sense as a general editor improvement if there are general agreement about it.

Mock-up:

[arkology]

I'm not sure how it will be possible to detect (for user) whether this file was added to Favorites directly or based on the resource type. If the Favorites files are stored as a list (the current implementation), and there is another separate list of favourite types, the editor will have to constantly parse all files in the project.