Resolve "Use conan for dependency management"

We now have conan support for dependency management.

Setup:

• install conan:

pip install conan

• configure conan to use our package repository for packages we (still) need to provide orselves:

conan remote add rwth-vr--bintray https://api.bintray.com/conan/rwth-vr/conan 

Build your project (from terminal):

cd <build directory>
conan install <relative path to source directory> --build=missing
cmake <relative path to source directory>

You can also use CMake-GUI for the last step.

Closes #18