Fix #16 - Add widget theme files to support custom console background

Based on the files in the [Spacegray theme](https://github.com/kkga/spacegray) I created widget files to set the background for the console, this also has the side effect of changing the background for text inputs. I couldn't find a way to override this for text inputs, so I adjusted the background of the text inputs to be the same dark blue that is used for the background of the find/replace panel, this is also what Spacegray does.