pwnable

Tl;dr: Use the workaround from https://github.com/pwndbg/pwndbg/pull/322/files only for broken gdb versions

Currently, we only have some integration tests (we test a bunch of modules together, with the goal of solving a challenge).
Adding unit tests, which test each component in isolation, can help us spot and fix bugs easier and faster. In particular, the arutil (utilities) module would be a good start.

This could be done by adding tests to pytest (the tests directory) or via [doctest](https://