Overhaul reports view to help staff identify urgent items

[deadroxy]

• Highlight "clusters" of multiple reports about same user
• Highlight new reports about pledgers previously warned
• Highlight multiple reports from same person
• Highlight multiple reports about same stream
• Allow mods to reverse sort of reports from oldest to newest
• Allow mods to sort/see reports with screenshots
• Highlight reports that reference affiliate channels

[deadroxy]

Closed with PR #61.