fix(classes): cleanup resources, add cancellable timeouts, and fix bugs in several core utility classes

ts/classes.stringmap.ts

@@ -116,4 +116,12 @@ export class Stringmap {
     });
     this._triggerUntilTrueFunctionArray = filteredArray;
   }
+
+  /**
+   * destroys the Stringmap, clearing all strings and pending triggers
+   */
+  public destroy() {
+    this._stringArray = [];
+    this._triggerUntilTrueFunctionArray = [];
+  }
 }