* Change omz tool calls in sample scripts (linux) * Change omz tool calls in sample scripts (windows) * Remove venv creation and /tools/model_optimizer/requirements.txt installation * Remove `open_model_zoo/tools/downloader` from setupvars * Remove `accuracy_checker` from setupvars * Add error if omz tools are not installed * Update scripts/demo/run_sample_benchmark_app.bat Co-authored-by: Zlobin Vladimir <vladimir.zlobin@intel.com> * Add check for all omz tools Co-authored-by: Zlobin Vladimir <vladimir.zlobin@intel.com>