avfilter: add relative luminance mode to tonemap_opencl and tonemap_cuda #418
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This add a new mode which tonemap based on calculated relative luminance to OpenCL and CUDA tonemap filters as mentioned in #416. This mode does not crush blacks that much like the max mode and does not distorts the colors that heavily like the rgb mode. This mode has generally good perceptual quality but some color might appears thinner than max mode.
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