Switch to h/j/k/l keys

Use this if you need ⌃⌥ arrows or ⌥⇧ arrows in your apps (for example, to select by word).

1. Open ~/Library/Application Support/JimiOS Alpha/config.json.
2. Add "direction_keys": "hjkl".
3. Quit JimiOS from its menu and open it again.
4. Press ⌥/ to check: the panel now lists ⌥H/J/K/L and ⌥⇧H/J/K/L.

To go back, set "direction_keys": "arrows" or remove the line. Any other value, including the old "both", counts as arrows.