Pop Release 7.2.0

This release comes with a few fixes and minor additions.

Auto Load Plugins on Iteration

Plugins are normally lazy loaded, but when iterating over a subsystem all plugins need to be loaded. Since one would expect to be able to iterate over a sub, it has been added to automatically load all of the plugins when starting to iterate.

Add Callbacks For Signal Catches

The loop inside of pop can now be started with functions to call when receiving signals on unix systems. This makes it easier to respond cleanly to interrupt and term signals.