GitLab

Incorporate apple-specific OpenCL include directory from the other FindOpenCL.cmake in the platforms/opencl CMakeLists.txt file.
TODO - in future use only one FindOpenCL.cmake file.

OpenCL kernels are now stored into a C++ class at build time rather than installing them as text files.

Add updated platform support for the Khronos approved ICD model so AMD and newer Nvidia drivers on Windows/Linux will work.  Haven't tested Apple

Fixed uninitialized value problem with setting box vectors.  This caused sporadic multithreading issues on Linux platforms.

Use a consistent (and more accurate) value for electric constant everywhere.  Also cleaned up handling of constants and units in various places.