Remove use of deprecated React.PropTypes

Replace all uses of React.PropTypes with PropTypes and importing PropTypes from
'prop-types'.

src/components/structures/MessagePanel.js

@@ -16,6 +16,7 @@ limitations under the License.
 
 import React from 'react';
 import ReactDOM from 'react-dom';
+import PropTypes from 'prop-types';
 import classNames from 'classnames';
 import shouldHideEvent from '../../shouldHideEvent';
 import dis from "../../dispatcher";
@@ -32,63 +33,63 @@ module.exports = React.createClass({
 
     propTypes: {
         // true to give the component a 'display: none' style.
-        hidden: React.PropTypes.bool,
+        hidden: PropTypes.bool,
 
         // true to show a spinner at the top of the timeline to indicate
         // back-pagination in progress
-        backPaginating: React.PropTypes.bool,
+        backPaginating: PropTypes.bool,
 
         // true to show a spinner at the end of the timeline to indicate
         // forward-pagination in progress
-        forwardPaginating: React.PropTypes.bool,
+        forwardPaginating: PropTypes.bool,
 
         // the list of MatrixEvents to display
-        events: React.PropTypes.array.isRequired,
+        events: PropTypes.array.isRequired,
 
         // ID of an event to highlight. If undefined, no event will be highlighted.
-        highlightedEventId: React.PropTypes.string,
+        highlightedEventId: PropTypes.string,
 
         // Should we show URL Previews
-        showUrlPreview: React.PropTypes.bool,
+        showUrlPreview: PropTypes.bool,
 
         // event after which we should show a read marker
-        readMarkerEventId: React.PropTypes.string,
+        readMarkerEventId: PropTypes.string,
 
         // whether the read marker should be visible
-        readMarkerVisible: React.PropTypes.bool,
+        readMarkerVisible: PropTypes.bool,
 
         // the userid of our user. This is used to suppress the read marker
         // for pending messages.
-        ourUserId: React.PropTypes.string,
+        ourUserId: PropTypes.string,
 
         // true to suppress the date at the start of the timeline
-        suppressFirstDateSeparator: React.PropTypes.bool,
+        suppressFirstDateSeparator: PropTypes.bool,
 
         // whether to show read receipts
-        showReadReceipts: React.PropTypes.bool,
+        showReadReceipts: PropTypes.bool,
 
         // true if updates to the event list should cause the scroll panel to
         // scroll down when we are at the bottom of the window. See ScrollPanel
         // for more details.
-        stickyBottom: React.PropTypes.bool,
+        stickyBottom: PropTypes.bool,
 
         // callback which is called when the panel is scrolled.
-        onScroll: React.PropTypes.func,
+        onScroll: PropTypes.func,
 
         // callback which is called when more content is needed.
-        onFillRequest: React.PropTypes.func,
+        onFillRequest: PropTypes.func,
 
         // className for the panel
-        className: React.PropTypes.string.isRequired,
+        className: PropTypes.string.isRequired,
 
         // shape parameter to be passed to EventTiles
-        tileShape: React.PropTypes.string,
+        tileShape: PropTypes.string,
 
         // show twelve hour timestamps
-        isTwelveHour: React.PropTypes.bool,
+        isTwelveHour: PropTypes.bool,
 
         // show timestamps always
-        alwaysShowTimestamps: React.PropTypes.bool,
+        alwaysShowTimestamps: PropTypes.bool,
     },
 
     componentWillMount: function() {