Display time and memory count in tests

[mikaelmello]

I'm just listing some improvements that I'd like to implement in the near future [2]

[unneon]

The logic for that is ready, but CSS is utterly broken and I wasn't able to display it nicely. So, probably blocked on #7.

[unneon]

It's now possible to do this. The timing logic is ready, although it should use a system-backed measurement method. Memory count is not implemented, and both implementations should work both on Linux and Windows(with conditional compilation).

Also, I'm not sure where to display this information. There may be a bit too much content in the cells right now(actions, notes, stderr, soon probably scrollbars).