Added float, uint64, and uchar params to Algorithm

Made changes to work in cv::Algorithm with parameters of these types.
Also fixed SimpleBlobDetector -- now it can be created by
cv::Algorithm::create and it can work with cv::Algorithm::set/get.

modules/features2d/include/opencv2/features2d/features2d.hpp

@@ -658,6 +658,7 @@ protected:
   virtual void findBlobs(const Mat &image, const Mat &binaryImage, vector<Center> &centers) const;
 
   Params params;
+  AlgorithmInfo* info() const;
 };