make font list human-readable and parsable

I noticed that `-l` output the representation of `list`, which is hard to read and different than `figlist`, which lists like:

```
$ figlist | head -5
Default font: standard
Font directory: /usr/share/figlet
Figlet fonts in this directory:
1943____
3-d
```

I thought about mimic the exact format, but I think one font name per line is enough to be readable and parsable easily.