Add proper OpenPose + Caffe modules and add missing modules exports (e.g. LD_LIBRARY_PATH)

In addition, we still have this lying at the end of .bashrc of ARMAR-6 vision PC:

activate_cuda_10_1_cudnn_7_6
_axii_env_changes[LD_LIBRARY_PATH]="$CUDA_10_1_CUDNN_7_6_LD_LIBRARY_PATH:${_axii_env_changes[LD_LIBRARY_PATH]}"

Local cuda activations will be supported by: https://gitlab.com/ArmarX/meta/setup/-/merge_requests/172