Show block page visibility

Problem/Motivation

Working with a site that has a large number of blocks, I wanted a report to expose what pages the blocks appear on, without needing to click into each block's configuration. This module gets really close to what I needed.

Proposed resolution

I added some code to the controller to expose the information I was looking for. Patch is below. Most often in the block's visibility conditions, it's page specific (either hiding or showing on specific pages). That's all this code exposes.