[feature] Provide alternative shortcut for up/down arrows

[ohemelaar]

When using GPaste while typing, it can be a burden to have to move the right hand to the arrow keys in order to move the selection up or down. It would be great to provide an alternate shortcut for moving the selection up or down, for example with Ctrl + N for Next and Ctrl + P for previous, or Ctrl + J and Ctrl + K for those used to vim keybindings.

I see it is already possible to filter through the entries by typing some text, but this is not very practical when the clipboard entries are filled with random content and special characters (for example generated passwords, UUIDs, hex or base64 data...)