Warnings/errors expansion

[lskatz]

Is your feature request related to a problem? Please describe.
Now that warnings and errors are being displayed in sn_report.pl, need to consider what might be an error or a warning in each plugin.

Specification is listed here: https://github.com/lskatz/SneakerNet/blob/master/docs/SneakerNetOutput.md#propertiestxt

Describe the solution you'd like
Go through each plugin and determine if errors and/or warnings should be implemented.

Describe alternatives you've considered
Could also ignore this but I should probably do it.

Additional context