Truncate too big code samples while focusing on a certain line

A very minimal templating DSL inspired by hiccup. Using this to avoid
depending on a specific version of a tool that most people already have
in their web stack

The Prone middleware can be used to catch exceptions from your app and
present them in an interactive explorer UI. Stack traces will by default
be filtered to focus on your app's stack frames, and environment data is
available for inspection, along with data passed to Prone via
prone.debug/debug

Prepare data for serialization so it can safely go over the wire, and be
picked back up with read-string on the client.

Extract data from stack traces and represent them with plain maps

Start the fun!