Keybinds & Open button

After fighting with swing a bit more I finally figured out how to disable the default keybinds for the file tree so I could use the arrow keys. Had to also fight with focusing the right right components to get the keybinds to do anything.

• Added keybinds - left/A = previous image, right/D = next image, and delete/W = delete image.
• Rearranged the button layout a little to make the delete button harder to hit by accident.
• Added a new button to open the current image in your normal image viewer so you can zoom in/make quick edits.
• Added a filesize label.