Feat/libluis bin

This merge requests adds the native libraries of liblouis directly to the jar file, where they are extracted at runtime.

The binaries themselves are stored in a separate repo, which is embedded as a submodule in this git repo.

Right now, the system architecture is determined by the bitness of the java runtime only, meaning that, when executing BraillePlot on a 64 bit machine in a 32bit JRE, 32bit libraries will be loaded.

Currently, the binary repo does contain libraries for Windows, Linux and Apple OSX for the amd64 architecture.