This reverts commit 769c6314.

This reverts commit 0e928a58, reversing
changes made to 18755752.

Removes thread block size and work per thread in helpers.hpp since they would be double defined there

Removes the LOWER, UPPER definitions from the helpers so they are only in the openCL context's base macro map. Adds an options users can pass to global and local kernels to define macros.

Reduces the two THREAD_BLOCK_SIZE macros to just one. Moves a lot of macros from the kernel compilation step. adds documentation to functor

added compile time max wg size checks, changed the use of thread/thredblock to workitem/workgroup (WI/WG)

[Jenkins] auto-formatting by clang-format version 5.0.2-svn328729-1~exp1~20180509124008.99 (branches/release_50)

Changes all the kernel files so that they are placed into const char*'s within each kernel file. Doxygen works but the object holding the kernel code is undocumented. All of the kernel structs are moved into the respective kernel file

functions through kernel_cl.func(inputs).

Placed all kernels in STRINGIFY macros.
Kernels now have read_only, write_only read_write decorators to the kernel.