-RM-364-MR-Add OpenCL support
Add proper OpenCL support for OpenWalnut.
- Add classes for OpenCL contexts, kernels, buffers etc. using the c-API (C++ API is not up-to-date for NVIDIA cards; no access to buffer IDs etc.)
- Add OSG nodes that execute OpenCL kernels instead of rendering
- Add support for sharing resources with OpenGL
(from redmine: created on 2014-05-30)