Iqs blurdetection

create class BlurDetector to detect and calculate percent of pixel blur in the image, initialize the parameters for algorithm

Current parameters are not good, there some difficult use-cases in sharp image can be detected as blurred include : shadow, sky and water (false negative). Fine-Tuning parameters can cover some case of it, however it will make false positive on image of many details. There is way to pre-detect part like shadow, sky and water, however, i wonder if it overwhelm the algo.

Reader of metadata for searching focus region is not implemented yet. It will be my work for next week