Revery a recent change which seems to be corrected now.
Editor: Have the data explorer select and expand newly created assets.
Editor: Add ability to delete directories from the data explorer.
Editor: Add support for deleting a file from the data explorer.
Bring up to date with recent changes to GTGUI.

This fixes a crash when creating a new text file in the editor by hitting
the "Enter" key when typing in the name.