Verify if all properties of IHook are used

[kbouchard]

During TypeScript conversion, we noticed that two props in IHook were not documented and might not even be used in the code at all.

Look at this deeper, if they're not used, remove them. If they are, add documentation or evaluate how useful they are.

export interface IHook extends IWrapper {
  [key: string]: any;
  onBeforeMount: (tester: Tester, ops: IMountOps) => void;
  onInit: (tester: Tester) => void;
  props: object | (() => void);
  shortCuts: { [shortCutName: string]: () => void }; // USED ?
  wrapper: () => { Component: Component, name: string, props: object }; // USED ?
}