Code recipe for custom PMPro reporting to support multiple discount codes for a single sale #170

Is your feature request related to a problem? Please describe.
We sometimes have a few separate discount codes that apply for a single "sitewide sale" - for example when we ran our LTD we made custom discount codes for some proration.

We'd like to write a mega snippet that unhooks some default PMPro module reports and adds in custom reports to get this data from a group of discount code orders, not just the single discount code assigned to the sale.

Here are the filters we would unhook and create new reportss for:
https://github.com/strangerstudios/sitewide-sales/blob/dev/modules/ecommerce/pmpro/class-swsales-module-pmpro.php#L68-L77