Generate spam summary emails

[zackkatz]

This is the most-requested feature for the plugin.

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Settings page

• [x] Create a Gravity Forms global settings tab for Gravity Forms Zero Spam

The page should have three settings:

1. How frequently should spam report emails be sent? Daily, Weekly, Monthly, or Spam Entry Limit
2. If Spam Entry Limit is selected, show a number field, minimum 1. with the description "A spam report email will be sent when the number of spam messages reaches this number."
3. "Send spam report to:" email input type. The default address should be set to the site administrator.

Create a cron

• [x] Create a cron based on the settings

The cron should create the email report and send it to the email defined in the setting.

Generate email

• [x] Generate an email template

The email should be filterable for the subject line and content template. Variables should be replaced with live data.

Message subject:

Your Gravity Forms spam report for {{site_name}}

Message body:

<h2>Spam report</h2>

You have received {{total_spam_count}} spam emails across the following forms:

{{spam_report_list}}

To turn off this message, visit {{settings_url}}.

{{spam_report_list}} should be a <ul> list of forms that have spam messages, in the following format (assume repeating <li>s:

<ul>
<li><a href="{{form_spam_entries_url}}">{{form_name}} {{spam_count}}</a></li>
</ul>

[zackkatz]

@omarkasem Hey, can you please work on this after the other items?