Implement hierarchical breakdown exploration

[geoffxy]

We need to allow users to explore the breakdown data (run time and memory) in a more scalable way (in terms of visuals). The data is fundamentally hierarchical, so we need to change the presentation format to allow this kind of exploration.

• Make backend changes to allow the collection of module information
• Change the data model / report format to enable storing the hierarchical relationships in the data
• Make any necessary changes to the INNPV protocol
• Adjust the plugin data models
• Implement the interactive components in the plugin

[geoffxy]

This is complete as of commit 240d3c5.

There are still some rough edges (sort order, highlight clarity, module naming), but the overall functionality has been completed.