Jc

- Add verbose debug option using -dd argument

- Fix iptables parser issue which would not output the last chain

- Improve and standardize empty data check for all parsers

- Update airport_s parser to fix error on parsing empty data
- Update arp parser to fix error on parsing empty data
- Update blkid parser to fix error on parsing empty data
- Update crontab parser to fix error on parsing empty data
- Update crontab_u parser to fix error on parsing empty data
- Update df parser to fix error on parsing empty data
- Update free parser to fix error on parsing empty data
- Update lsblk parser to fix error on parsing empty data
- Update lsmod parser to fix error on parsing empty data
- Update mount parser to fix error on parsing empty data
- Update netstat parser to fix error on parsing empty data
- Update ntpq parser to fix error on parsing empty data
- Update ps parser to fix error on parsing empty data
- Update route parser to fix error on parsing empty data
- Update systemctl parser to fix error on parsing empty data
- Update systemctl_lj parser to fix error on parsing empty data
- Update systemctl_ls parser to fix error on parsing empty data
- Update systemctl_luf parser to fix error on parsing empty data
- Update uptime parser to fix error on parsing empty data
- Update w parser to fix error on parsing empty data
- Update xml parser to fix error on parsing empty data
- Add tests to all parsers for no data condition
- Update ss parser to fix integer fields

- Update ls parser to fix error on parsing an empty directory

- Add local parser plugin feature (contributed by Dean Serenevy)