V2

[mrozbarry]

Migrate to V2

Tasks

• [x] Remove legacy code
• [x] Get v2 dependencies
• [x] Build higher-order app function to get a stream of debug data
• [x] Build a test app to cover common things the debugger needs to interpret

[mrozbarry]

Squashed in commits, since there were a lot of incremental changes that wouldn't make sense as a rebase.