cmake: refactored scripts with samples building:

- allow installing samples sources on all platforms
  even if BUILD_EXAMPLES is disabled,  fixed minor
  issues in sources installation process
- use 'example_<group>_<name>' scheme for target and binary file naming
- use single function for sample executable creation

samples/cpp/tutorial_code/calib3d/real_time_pose_estimation/CMakeLists.txt

@@ -1,5 +1,5 @@
 set(sample_dir ${CMAKE_CURRENT_SOURCE_DIR}/tutorial_code/calib3d/real_time_pose_estimation/src/)
-set(target cpp-tutorial-)
+set(target example_tutorial_)
 
 set(sample_pnplib
         ${sample_dir}CsvReader.cpp
@@ -12,6 +12,8 @@ set(sample_pnplib
         ${sample_dir}RobustMatcher.cpp
 )
 
+ocv_include_modules_recurse(${OPENCV_CPP_SAMPLES_REQUIRED_DEPS})
+
 add_executable( ${target}pnp_registration ${sample_dir}main_registration.cpp ${sample_pnplib} )
 add_executable( ${target}pnp_detection ${sample_dir}main_detection.cpp ${sample_pnplib} )
 

samples/cpp/tutorial_code/snippets/imgproc_HoughLinesPointSet.cpp

@@ -1,4 +1,5 @@
-#include <opencv2/opencv.hpp>
+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
 
 using namespace cv;
 using namespace std;