Made mapRenderings rewritable

Models/ThemeConfig/Json/RewritableConfigJson.ts

@@ -1,5 +1,43 @@
 import {TagRenderingConfigJson} from "./TagRenderingConfigJson";
 
+/**
+ * Rewrites and multiplies the given renderings of type T.
+ * 
+ * For example:
+ *
+ *
+ * ```
+ * {
+ *     rewrite: {
+ *         sourceString: ["key", "a|b|c"],
+ *         into: [
+ *             ["X","Y", "Z"],
+ *             [0,1,2]
+ *         ],
+ *         renderings: {
+ *             "key":"a|b|c"
+ *         }
+ *     }
+ * }
+ * ```
+ * will result in _three_ copies (as the values to rewrite into have three values, namely:
+ * 
+ * [
+ *   {
+ *   // The first pair: key --> X, a|b|c --> 0
+ *       "X": 0
+ *   },
+ *   {
+ *       "Y": 1
+ *   },
+ *   {
+ *       "Z": 2
+ *   }
+ * 
+ * ]
+ * 
+ * 
+ */
 export default interface RewritableConfigJson<T> {
     rewrite: {
         sourceString: string[],