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/ui/components/trends_panel.js

@@ -1,8 +1,5 @@
-import React from 'react';
-import PropTypes from 'prop-types';
 import { NavLink, withRouter } from 'react-router-dom';
 import { FormattedMessage, injectIntl } from 'react-intl';
-import { connect } from 'react-redux';
 import { fetchTrends } from '../../../actions/trends';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import ImmutablePropTypes from 'react-immutable-proptypes';