Added webpack.ProvidePlugin for most used imports

Removed imports of React, connect, PropTypes throughout
Removed the "React" in React.Component/PureComponent

app/javascript/gabsocial/features/home_timeline/containers/column_settings_container.js

@@ -1,4 +1,3 @@
-import { connect } from 'react-redux';
 import ColumnSettings from '../components/column_settings';
 import { changeSetting, saveSettings } from '../../../actions/settings';