[refactor] Moved Settings to TypeScript

Moved the UI binding to a separate file as there is still a circular
dependency with 'engine'. But every other file that depends on Settings
is no longer part of a larger dependency cycle.

src/types.ts

@@ -14,3 +14,24 @@ export interface IMap<T> {
  * Performs some action, with no returned value.
  */
 export type Action = () => void;
+
+/**
+ * Contains a method to initialize itself to a known state.
+ */
+export interface ISelfInitializer {
+  /**
+   * Initialize/reset the object to a known, default state.
+   */
+  init(): void;
+}
+
+/**
+ * Contains a method to repopulate itself based on a JSON string.
+ */
+export interface ISelfLoading {
+  /**
+   * Loads the save state onto the current object.
+   * @param saveState JSON string representing the save state.
+   */
+  load(saveState: string): void;
+}