Mostly based on Kevin's D4930 for OpenCL parsing.
LLVM has CUDA support since 3.9 [1], though not really good :/
Also added configuration UI for CUDA and OpenCL parser arguments.

[1] http://releases.llvm.org/3.9.1/docs/CompileCudaWithLLVM.html

Tested locally with a small CUDA project. It still can't parse perfectly, but at least won't mark everything as error. The language standard settings not actually work though.