Support OpenCL source code

OpenCL source code needs to be compiled at run time, and thus needs to be passed as string to the OpenCL run-time library. This makes writing OpenCL source code inconvenient.

This patch adds .cl as supported file type to Cactus. .cl files are transformed into globally visible strings, with a name consisting of the thorn name and file name. These strings can then be easily used at run time to build and run OpenCL code.

Since .cl files are converted to strings (and are not OpenCL-compiled at build time), there are no CL options specifying compiler type, compiler flags etc.

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