This adds the following CLI flags:
- `--truncate-owner-after`
- `--truncate-owner-marker`
And the following configuration fields:
```yaml
truncate-owner:
after:
marker: ""
```
The default behavior of LSD is unchanged.
The problem this change attempts to solve is the usability of the `-l`
flag on systems where some user or group names are long but cannot be
changed (e.g. the user is not admin and the account is managed in a
central directory). In such cases, even with a decently sized terminal
(90+ characters wide), lines often overflow, making the directory
listing hard to read.
Without this change, the only mitigation would consist in turning off
the display of file ownership (via the `blocks` configuration field)
which is unsatisfactory because ownership information is very useful.
`ls` from coreutils has the `--group-directories-first` flag as the only
directory grouping option. This patch improves compatibility so that
users switching to `lsd` can continue using `--group-directories-first`.
