Global CMake reorganization:

[~] Automatically tracked dependencies between modules
 [+] Support for optional module dependencies
 [+] Options to choose modules to build
 [~] Removed hardcoded modules lists from OpenCVConfig.cmake, opencv.pc and OpenCV.mk
 [+] Added COMPONENTS support for FIND_PACKAGE(OpenCV)
 [~] haartraining and traincascade are moved outside of modules folder since they aren't the modules

modules/stitching/src/exposure_compensate.cpp

@@ -43,9 +43,6 @@
 #include "precomp.hpp"
 
 using namespace std;
-#ifndef ANDROID
-using namespace cv::gpu;
-#endif
 
 namespace cv {
 namespace detail {