Ability to set what level of errors to catch

[mjangda]

When scanning, you should be able to specify that the level of errors you want to see. For example: only Blockers; or only Blockers, Warnings, and Notes.

[mfields]

Plans to move forward:

• Add ability to define levels when registering a new review.
• These levels should somehow map to "Pass" and "Fail".
• Dynamically generate a list of checkboxes in VIP_Scanner_UI::display_vip_scanner_form() enabling a user to choose the levels to be included in the report. This is similar to the Theme Check plugin's "Suppress INFO" checkbox.

[joshbetz]

from @nickdaugherty:

• Don’t report stuff like adding filters – why is this a thing? At least collapse those, get them out of regular results.
• Why is using transients flagged?