Many Changes around Attachments, Scopes, and Sanitation

This release is a fairly heavy one, containing the following changes:

• Added alerts.sanitize(), which attempts to strip out IPv4, IPv6, and URLs from given text. I highly recommend using this function if you are doing things like sending yourself Mission Titles via SMS, Email, Slack, etc.
• Integrated PR from @KeanuNys in regards to pulling attachments. Also added functionality to save them to the Scratchspace.
• Changed targets.get_scope* so they no longer automatically save results to the database. This caused a lot of grief around targets which had enormous scopes (/16 and the like)
• Fixed the ./checks.sh script to properly report when documentation is missing
• Modified Template functionality to use alerts.sanitize() to ensure mission template titles don't have things like client IPs/URLs.