set_ambient_and_diffuse
Description:
Conveniently sets the diffuse and ambient color of this at the same time.
Note: 
      
        
    
    Use the CoglSnippet shader api for lighting
See set_ambient and set_diffuse.
The default ambient color is (0.2, 0.2, 0.2, 1.0)
The default diffuse color is (0.8, 0.8, 0.8, 1.0)
Parameters:
| this | A  | 
| color | The components of the desired ambient and diffuse colors |