additional colors under admin control

src/app/interfaces/station-config.ts

@@ -37,4 +37,8 @@ export interface StationConfig {
   color_success: string;
   color_danger: string;
   color_info: string;
+  color_white: string;
+  color_light: string;
+  color_medium: string;
+  color_black: string;
 }