Clean up stack trace even more

This is a very ugly example:

```
visualize(std::vector, Eigen::aligned_allocator > > const&)
```

The allocators could be removed by matching `std::vector` where `Bar` has an equal number of <>. This would give us:

```
visualize(std::vector > const&)
```

To cleanup further we could let the Loguru user install hookups for replacing e.g. `Eigen::Matrix` with `Vector3f`, which would give us:

```
visualize(std::vector const&)
```