Add Core Spotlight Search for system search results

[rodericj]

https://developer.apple.com/documentation/corespotlight/cssearchableitemattributeset

Already have a prototype working. Should figure out what image to use and how to actually deep link when it is tapped.

Trees kink may require caching the region objects to disk so we have then when we open the app.

[rodericj]

Current status

[rodericj]

Relevant: https://stackoverflow.com/a/56508769

Currently not seeing the app delegate func get called when I tap the search results

[rodericj]

Got the initial implementation up and running but do need to cover the case where the region is not loaded into memory yet, as in when the app is killed by the OS.

[rodericj]