* Added pugixml as submodule
* CVS-34900: updated pugixml to v1.11.4
* Fixed link with pugixml
* USe pugixml::static
* Try to fix bug
* Removed GITHUB_PULL_REQUEST
* Replaced OpenVINO_MAIN_SOURCE_DIR -> OpenVINO_SOURCE_DIR
* Removed some usages of IE_MAIN_SOURCE_DIR
* Use ngraph target directly