* NGraph - FrontEndManager - common API
Added Mock frontend for unit testing
* Comment out installation rules
* Fixed review comment
Introduced environment variable OV_FRONTEND_PATH for frontend paths
* Additional cmake cleanup
* More fixes of cmakelists
* Changing template file name for frontends
* Changed copyrights
* Reuse ngraph-utils for file-related operations
* Correct of frontend file extension for macos
More code coverage
* Renamed all methods to according to ngraph-style
In case of unset or empty OV_FRONTENT_PATH - load plugins from current working directory
* Fix review comments
Add clang format target for frontend_manager and mock frontend plugin
* Update docs for FrontEndCapabilities
* Use constants for flags instead of 'enum'
* clang style fix
* Fix comment: using namespace ngraph...
* Fix comment: use replace "frontend_manager" with ${TARGET_NAME} in CMakeLists.txt
* Comment fix: rename 'generic' folder to 'frontend_manager'
* Update documentation comments
* Set FrontEndManager class as 'final'
* Apply review comments
* renamed get_place_by_name_and... to get_place_by_operation_name_and...
* Separated frontend_manager.hpp into 4 header files
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