* Add get_detected_gpus() and supported_render_engines() to Blender class
* Parse help args for Blender
* Return dict instead of list
* Parse args for FFMPEG
* Add API to get renderer args
* Only return available renderers
* Parse help args for Blender
* Return dict instead of list
* Parse args for FFMPEG
* Rebase off master
* Rebase
* Change methods from class methods to instance methods
* FFMPEG format fetching
* Add blender_downloader.py
* Add engine_manager.py
* Add additional methods to engine_manager.py
* Refactor file layout to make engines on par with workers
* Add system platform info to status response
* Default to using system platform / cpu if none are provided
* Add API to download an engine and some general cleanup
* Add method to delete downloaded engine
* Add API calls to download engines and delete downloads
* Misc fixes
