Blender GPU / CPU Render (#81)

* Add script to get GPU information from Blender

* Change run_python_script to allow it to run without a project file

* Simplify run_python_script code

* Fix mistake

* Add system_info to engine classes and api_server. /api/renderer_info now supports standard and full response modes.

* Get full renderer_info response for add job UI

* Enable setting specific Blender render_device using args

* Add Blender render device options to UI

src/engines/blender/blender_ui.py

@@ -4,5 +4,6 @@ class BlenderUI:
     def get_options(instance):
         options = [
             {'name': 'engine', 'options': instance.supported_render_engines()},
+            {'name': 'render_device', 'options': ['Any', 'GPU', 'CPU']},
         ]
         return options