Add keyboard shortcuts to navigate in entry tree

[Sergueille]

Describe Your Suggestion

• Up Arrow and Down Arrow: select the file above or under the selected file in the list
• Right Arrow: if a folder is selected, expand it and select it's first element

If this is too confusing, add a modifier key like Ctrl

[Sergueille]

I would be happy to try changing this myself, but it will take some time...

[craftablescience]

This is already implemented in code, it broke in 4.0

[craftablescience]

(and has since been patched)