refactor: make characteristic a seperate type to allow additional images

src/core/things/Dish.ts

@@ -46,7 +46,7 @@ export interface SCDishWithoutReferences
   /**
    * Characteristics of the dish
    */
-  characteristics?: string[];
+  characteristics?: Characteristic[];
 
   /**
    * Nutrition information (calories and nutrients with amounts)
@@ -90,6 +90,28 @@ export interface SCDishTranslatableProperties
   extends SCThingWithCategoriesTranslatableProperties, SCThingThatCanBeOfferedTranslatableProperties {
 }
 
+/**
+ * Composition of properties of a food characteristic
+ */
+export interface Characteristic{
+
+  /**
+   * Name of the characteristic
+   */
+  name: string;
+
+  /**
+   * The superscript text, that will be shown as a reference to this Characteristic
+   */
+  superscriptText?: string;
+
+  /**
+   * Image of the characteristic
+   */
+  image?: string;
+
+}
+
 /**
  * Dish meta data
  */