* First IntelGPU backend based on clDNN with empty functions

* Backend/API:Conflicts resolved and comments addressed

* backend libraries now found in tree

dynamically read header search paths

fix running from install

* Update cmake files to more modern approach

* disable building libraries that are not required

* handle more build cases

* add versions to backend libs. add start of package target.

* add create_backend to backends

* temporary workaround to tbb not linking correctly with gcc

* install codegen lib

* force tbb to link to the cpu backend so that it is available for codegen

* fix clang build error

* fix warning for codegen build

* update cuda header paths

* change error message for opening backend shared library

* set lib path

* Move runtime::Manager functionality into runtime::Backend

* Remove unused files

* remove obsolete function

* remove deprecated

* remove all legacy Backend API usage

remove deprecated files

* pull in changes from master

* fix GPU calls

* disable tests in convolution generator

* update per PR comments. Enable performance counter feature.

* update per PR comments

* fix build error

* fix conditionally compiled test :(

* add visualize option to nbench

* check for dot, amend help msg

* add compile benchmark

* add help when error

* Add cpio file read/write class and unit tests

add reserializer

Add unit test for serialize constants to cpio file. Fix bug in serializer if function has no parameters.

* fix detailed timing flag

* more detailed info

* make json lib an external project
* add env var to turn warnings to errors