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

cmake/OpenCVDetectApacheAnt.cmake

@@ -0,0 +1,16 @@
+file(TO_CMAKE_PATH "$ENV{ANT_DIR}" ANT_DIR_ENV_PATH)
+file(TO_CMAKE_PATH "$ENV{ProgramFiles}" ProgramFiles_ENV_PATH)
+
+find_host_program(ANT_EXECUTABLE NAMES ant.bat ant
+  PATHS "${ANT_DIR_ENV_PATH}/bin"
+        "${ProgramFiles_ENV_PATH}/apache-ant/bin"
+  )
+
+if(ANT_EXECUTABLE)
+  execute_process(COMMAND ${ANT_EXECUTABLE} -version
+    OUTPUT_VARIABLE ANT_VERSION_FULL
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+  string(REGEX MATCH "[0-9]+.[0-9]+.[0-9]+" ANT_VERSION "${ANT_VERSION_FULL}")
+
+  message(STATUS "    Found apache ant ${ANT_VERSION}: ${ANT_EXECUTABLE}")
+endif()