The current test runner relies on a built version of mica to run its tests
and on a bash-like shell
This is suboptimal since rust already provides a good framework

To make use of this, I added a custom rust test runner,
making use of libtest-mimic to emulate the base behaviour
of cargo test.

This test runner loads all mica files from the tests folder
and then runs them as actual tests

Now the test runner identifies each test by its containing folder

The general idea is: All tests must succeed always.
The `.skip`attribute is intended to skip long tests by default