To ensure simplicity of the process, replace the rotate actions with new two actions, without modifying the existing rotate_image method. Part-of: <https://gitlab.gnome.org/Incubator/loupe/-/merge_requests/201>
The 'delete' action contains several shortcuts, which makes it appear too long on the help-overlay. This patch resolves the issue by displaying only one shortcut for it. Part-of: <https://gitlab.gnome.org/Incubator/loupe/-/merge_requests/200>
Part-of: <https://gitlab.gnome.org/Incubator/loupe/-/merge_requests/165>