Preserving runtime state across sessions
TODO: table of things that can be stored (mark old-style things like commands and options as obsolete).
TODO: merging of state.
Remembering last visited directories of panes
TODO: how it affects starting Vifm without arguments.
Quitting Vifm started in file picker mode (e.g. from Vim plugin)
-f command-line argument.
TODO: running commands store selection and quit.
TODO: selection storage.
TODO: example for shell.