Merge pull request #13030 from dmatveev:tutorial

* G-API: First steps with tutorial

* G-API Tutorial: First iteration

* G-API port of anisotropic image segmentation tutorial;
* Currently works via OpenCV only;
* Some new kernels have been required.

* G-API Tutorial: added chapters on execution code, inspection, and profiling

* G-API Tutorial: make Fluid kernel headers public

For some reason, these headers were not moved to the public
headers subtree during the initial development. Somehow it even
worked for the existing workloads.

* G-API Tutorial: Fix a couple of issues found during the work

* Introduced Phase & Sqrt kernels, OCV & Fluid versions
* Extended GKernelPackage to allow kernel removal & policies on include()

All the above stuff needs to be tested, tests will be added later

* G-API Tutorial: added chapter on running Fluid backend

* G-API Tutorial: fix a number of issues in the text

* G-API Tutorial - some final updates

- Fixed post-merge issues after Sobel kernel renaming;
- Simplified G-API code a little bit;
- Put a conclusion note in text.

* G-API Tutorial - fix build issues in test/perf targets

Public headers were refactored but tests suites were not updated in time

* G-API Tutorial: Added tests & reference docs on new kernels

* Phase
* Sqrt

* G-API Tutorial: added link to the tutorial from the main module doc

* G-API Tutorial: Added tests on new GKernelPackage functionality

* G-API Tutorial: Extended InRange tests to cover 32F

* G-API Tutorial: Misc fixes

* Avoid building examples when gapi module is not there
* Added a volatile API disclaimer to G-API root documentation page

* G-API Tutorial: Fix perf tests build issue

This change came from master where Fluid kernels are still used
incorrectly.

* G-API Tutorial: Fixed channels support in Sqrt/Phase fluid kernels

Extended tests to cover this case

* G-API Tutorial: Fix text problems found on team review

modules/gapi/src/api/gkernel.cpp

@@ -34,6 +34,12 @@ bool cv::gapi::GKernelPackage::includesAPI(const std::string &id) const
     return (it != m_backend_kernels.end());
 }
 
+void cv::gapi::GKernelPackage::removeAPI(const std::string &id)
+{
+    for (auto &bk : m_backend_kernels)
+        bk.second.erase(id);
+}
+
 std::size_t cv::gapi::GKernelPackage::size() const
 {
     return std::accumulate(m_backend_kernels.begin(),
@@ -53,7 +59,7 @@ cv::gapi::GKernelPackage cv::gapi::combine(const GKernelPackage  &lhs,
     {
         // REPLACE policy: if there is a collision, prefer RHS
         // to LHS
-        // since OTHER package has a prefernece, start with its copy
+        // since RHS package has a precedense, start with its copy
         GKernelPackage result(rhs);
         // now iterate over LHS package and put kernel if and only
         // if there's no such one