[pickling] Store hash of pickled XML file for lookup and recreation if necessary

[jsturdy]

Brief summary

As I understand it, there exists no current way to map a pickled address table with an XML address table
In addition to a versioning inside the XML address table (which would be fantastic, but less important as the address table doesn't necessarily change when the FW changes), it would be great if the pickle file could easily "know" which XML file it came from, and hashing seems like the simplest and most straightforward way

Types of issue

• Feature request (request for change which adds functionality)

Context

• easy knowledge of which XML file was used to create the pickle file
• could be used for pickle file auto-generation with new XML file, though I believe we previously had discussed pro/cons of this
• versioning of pickle files?