This commit adds a new API tha allow to replace the bgl API in the exemples on: https://docs.blender.org/api/current/gpu.html **Overview (New API):** ``` gpu.state: active_framebuffer_get GPUFramebuffer: read_color GPUOffscreen: texture_color ``` Reviewed By: brecht Differential Revision: https://developer.blender.org/D11031