- do not store user-controlled "FileStorage" pointer
- store FileStorage::Impl pointer instead

* fixed issue #17412

* Update test_io.cpp

GAPI: Migration to IE Core API

* Migration to IE Core API
 - both versions are maintained
 - checked building with all the OpenVINO versions (2019.R1, R2, R3, 2020.4 (newest))

* commit to awake builders

* Addressing comments
 - migrated to Core API in 'gapi_ie_infer_test.cpp'
 - made Core a singleton object
 - dropped redundant steps

* Addressing comments
 - modified Mutex locking

* Update

* Addressing comments
 - remove getInitMutex()
 - reduce amount of #ifdef by abstracting into functions

* return to single IE::Core

* Divide functions readNet and loadNet to avoid warnings on GCC

* Fix deprecated code warnings

* Fix deprecated code warnings on CMake level

* Functions wrapped
 - All the functions depended on IE version wrapped into a cv::gapi::ie::wrap namesapace
 - All this contained to a new "giebackend/gieapi.hpp" header
 - The header shared with G-API infer tests to avoid code duplications

* Addressing comments
 - Renamed `gieapi.hpp` -> `giewrapper.hpp`, `cv::gapi::ie::wrap` -> `cv::gimpl::ie::wrap`
 - Created new `giewrapper.cpp` source file to avoid potential "multiple definition" problems
 - removed unnecessary step SetLayout() in tests

* Enabling two NN infer teest

* Two-NN infer test change for CI
 - deleted additional network
 - inference of two identical NN used instead

* Fix CI fileNotFound

* Disable MYRIAD test not to fail Custom CI runs

original commit: 2813aa7e

Documentation fixes/improvements

* Documentation fixes/improvements

* Remove HASH_UTILS defines

[G-API] Allow building graphs with a dynamic number of inputs and outputs

* Add dinamic graph feature and tests

* Remove unnecessary file

* Review response

* Add implementation of operator += for GRunArgs
And test for that case

* Tests refactoring

* Add doxygen
Review response

* Fix docs

* A small documentation fix

* Review response

* Add tests for more entities

* Add typed tests

* Another typed tests

* Doc fix

* Documentation fix

* Build fix

* Commit for rebuild

* The last one