Python pip3 installable Malmo

For Malmo to be used widely for both exploring and teaching reinforcement learning in a games environment, it needs to be simple to build and install on multiple operating systems. This release addresses some of the cross platform build issues by removing the C++ XSD code generation and using a modern version of CMake (without custom extensions). This unfortunately entails dropping direct support for Lua and Mono, focusing the project on Python (version 3), while still providing direct support for C++; C# (on Windows and hopefully supporting .NET Core soon) and Java. Other languages that can link to C/C++ (Lua included) can easily be added using Swig (http://www.swig.org/), JVM or other cross language interop mechanism.

We can now provide a pip3 installable (native) Python module (“pip3 install malmo”) for Windows, MacOS and Linux. There are some remaining strict dependencies on Python 3, Boost and Java 8 that still need to be pre-installed but we hope that being able to install Malmo from the network will make it significantly easier to start using Malmo.

Other changes in this release address the set-up and reliability of communications between the Malmo agent and the Minecraft Mod.