lldb debugging enhancements

The code in this directory is imported via .lldbinit.

Working directory .lldbinit is not loaded by default.

You can add the following to ~/.lldbinit to load it when launching lldb from the command line:

settings set target.load-cwd-lldbinit true

If you're using VS Code, you can instead add the following to your configuration:

"lldb.launch.initCommands": ["command source ${workspaceFolder}/.lldbinit"]