Results 4 issues of Jonnie

Port settings tables to json and parse them. Also create a default `navigator.conf` file.

Mpv script utils have come a long way since this script was created. This script could be improved a lot with readdir, file_info and path_join functions.

This script is very old and hacky. It could use a rewrite to up to date MPV utilities. related issue and PR #8 #11

Display only some items at a time and keep the curstor visible when scrolling. This should be as automagic as possible, perhaps see [mpv-repl](https://github.com/rossy/mpv-repl/blob/f7538adea92b441f2c7edd5dc07dd50dac28d3d5/repl.lua#L154) as reference, since it seems to...