[BUG FIX] Add Focused style using Keyboard/Gamepad with buttons like Hover for mouse.

After creating a number of buttons in vertical box and setting Normal, Hover and Pressed images navigation with a mouse works properly however navigating the same button list with a keyboard/gamepad only draws a dotted box around the focused button instead of displaying the “Hovered” image. This is basic functionality that in my opinion should take precedence over everything else. People are getting over this by creating arrays and button lists to manually set the button image based on ‘Is Focused’ which is a pain to keep up to date as the game evolves.