EntityRenderer class

Subclass this to implement rendering for different kind of entities.

The EntityRenderer type exposes the following members:

Constructor	Description
`__init__(self, key, features)`	Constructor of `EntityRenderer`
`__init__(self, key)`	Constructor of `EntityRenderer`

Method	Description
`initialize(self, renderer)`	Initialize the entity renderer
`reset_scene_cache(self)`	The scene has changed or removed, need to dispose scene-level render resources in this
`frame_begin(self, renderer, render_queue)`	Begin rendering a frame
`frame_end(self, renderer, render_queue)`	Ends rendering a frame
`prepare_render_queue(self, renderer, queue, node, entity)`	Prepare rendering commands for specified node/entity pair.
`render_entity(self, renderer, command_list, node, renderable_resource, sub_entity)`	Each render task pushed to the `IRenderQueue` will have a corresponding RenderEntity call to perform the concrete rendering job.
`dispose(self)`	The entity renderer is being disposed, release shared resources.