title: getNameByAlias removed in Ext JS 5
body: <p>Currently a Ext JS 4 uses getNameByAlias of <a href="https://docs.sencha.com/extjs/4.2.6/#!/api/Ext.ClassManager" rel="nofollow noreferrer">https://docs.sencha.com/extjs/4.2.6/#!/api/Ext.ClassManager</a> in its code to map database dynamic alias configurations to class matching to it.</p>
  <p>Application needs to upgrade Ext JS. In Ext JS 5 method was removed. Having an extjs alias, is there a dynamic way by code to determine the matching implementation class?</p>
  <p>Ext.define('classNameIneed',
  extends: ...,
  alias: 'aliasIhave',
  ....</p>