lookup_color
Description:
Looks up color_name in the style’s logical color mappings, filling in color and returning 
      true if found, otherwise returning false.
Note: 
      
        
    
    Use lookup_color instead
Do not cache the found mapping, because it depends on the Style and might change when a theme switch occurs.
Parameters:
| this | 
           a Style  | 
      
| color_name | 
           the name of the logical color to look up  | 
      
| color | 
           the Color to fill in  | 
      
Returns:
| 
           true if the mapping was found.  |