Add support for miss_hit (MATLAB)

**Name:** miss_hit
**URL:** https://github.com/florianschanda/miss_hit

Currently, ALE only supports mlint for MATLAB. Unfortunately, it is proprietary and only comes bundled with a MATLAB distribution. A free alternative is miss_hit, which has `mh_style` to identify and fix style issues, and `mh_lint` for linting. Incorporating it into ALE will be useful for those running compatible code in Octave, for instance.