Implement approval queue for adult sites

[JimKillock]

We are getting a lot of adult and 'hookup' dating sites applying to have filtering removed. These sites have no hope of success with most ISPs. The applications look like they are being done in a systematic way for some company or companies with boilerplate sites. Could we therefore:

1. Implement a queue for approval of submissions where the site has been labelled as "adult" or "dating" by the third party tagging systems
2. Allow any admin user to approve or reject these submissions
3. Include in the submission process a means to block / ban users making these submissions

We could consider allowing front end users to avoid this queue, if for instance they had previously submitted successful unblocking complaints. But this isn't necessary for now.

[dantheta]

Added hold queue to the ISP reports screen. Each item in the hold queue can be released by an admin.

A behaviour flag has been added to the categories table in the DB enabling the new functions, and this has been set for categorify's adult, dating, unsafe and malicious categories.

[Mike-ORG]

@JimKillock now that these reports are being held, what is our criteria for rejecting or approving them? Should we focus on rejecting the generic dating site lookalikes for now?

[Mike-ORG]

I ask because it would be good if we could clear out the growing list of "holds".