Crypto and networking utils used for ABY and OTExtension

This library can be built in the following way. If MIRACL cannot be found on the system, it is used via the git submodule extern/MIRACL and automatically compiled.

$ mkdir build && cd build
$ cmake .. -DCMAKE_INSTALL_PREFIX=/path/to/installation
$ make -j $(nproc)

If desired, the build can be installed to the chosen DCMAKE_INSTALL_PREFIX. In case MIRACL was built in the previous step, it will also be installed.

$ make install  # if desired