Merge pull request #682 from endJunction/DataExplorerShortcuts

[A] Add Ctrl+Q for exit; Ctrl+O for open shortcuts

Applications/DataExplorer/mainwindow.ui

@@ -255,6 +255,9 @@
    <property name="toolTip">
     <string>Loads a OGS-native file. E.g. gli, gsp, gml, msh, stn.</string>
    </property>
+   <property name="shortcut">
+    <string>Ctrl+O</string>
+   </property>
   </action>
   <action name="action_Exit">
    <property name="text">
@@ -263,6 +266,9 @@
    <property name="toolTip">
     <string>Exits the application.</string>
    </property>
+   <property name="shortcut">
+    <string>Ctrl+Q</string>
+   </property>
   </action>
   <action name="actionPoints_view">
    <property name="checkable">