* Use a "drawOnYourScreen" subdir in the xdg user data dir
* Info item with the name of the last saved/open json file
* "Open drawing" sub menu with data dir content
* "Save drawing" sub menu with entry
* "Save", "Open previous" and "Open next" keybindings
* Set 'max-height' property to menu actor.
* Reduce size of menu items.
* Rename 'draw-on-your-screen-menu-separator' style class to 'draw-on-your-screen-menu-separator-item' because it is relative to the item actor, not the item._separator actor.
* Rename 'draw-on-your-screen-separator' style class to 'draw-on-your-screen-helper-separator' not to confuse with menu separator.