Merge pull request #4253 from nyalldawson/multi_canvas2

[FEATURE] Multi canvas/additional map views

Author: nyalldawson

images/images.qrc

@@ -556,6 +556,9 @@
         <file>themes/default/processingAlgorithm.svg</file>
         <file>themes/default/processingResult.svg</file>
         <file>themes/default/search.svg</file>
+        <file>themes/default/mActionNewMap.svg</file>
+        <file>themes/default/mActionMapSettings.svg</file>
+        <file>themes/default/mActionLockExtent.svg</file>
     </qresource>
     <qresource prefix="/images/tips">
         <file alias="symbol_levels.png">qgis_tips/symbol_levels.png</file>