Split cvGPUSpeedup repository into cvGPUSpeedup and FusedKernelLibrary

[morousg]

How to:

Create a branch in this repo.
Inside this branch:

1. Move the contents of the folder cvGPUSpeedup\tests\fused_kernel_library to cvGPUSpeedup\include\tests\ and make sure that it compiles.
2. Move all the code in cvGPUSpeedup\include\tests\ and cvGPUSpeedup\include\fused_kernel to the new repo: Fused Kernel Library
3. Make sure the FKL tests compile, and add the version 0.0.1 with tag Alpha_0.0.1.
4. Remove all the FKL files in this branch and leave only the cvGPUSpeedup files.
5. Find a way to make each future cvGPUSpeedup version, to depend/require an specific FKL version.
6. Make the cmake (or github) in cvGPUSpeedup to automatically download the proper FKL version.

[albertandaluz]

we are also moving npp benhcmakrs to the fkl repo