show texture file size and resolution in node editor

would be handy to show the file size in the node editor, possibly as an additional info section at the bottom of the image texture node, or when hovering over it (currently just the file name is in the popup tool tip).

Maybe a scene memory dialog too, like in Houdini, so I can easily see which assets are taking up most memory. Particularly textures, but a realtime memory usage would be cool too, for things like sims).