Add QHistoryLineEdit to browsers.

src/SeerVariableLoggerBrowserWidget.ui

@@ -17,7 +17,7 @@
    <item row="0" column="0">
     <layout class="QHBoxLayout" name="horizontalLayout">
      <item>
-      <widget class="QLineEdit" name="variableAddLineEdit">
+      <widget class="QHistoryLineEdit" name="variableAddLineEdit">
        <property name="toolTip">
         <string>Add a variable to the loggger.</string>
        </property>
@@ -88,6 +88,13 @@
    </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>QHistoryLineEdit</class>
+   <extends>QLineEdit</extends>
+   <header location="global">QHistoryLineEdit.h</header>
+  </customwidget>
+ </customwidgets>
  <resources>
   <include location="resource.qrc"/>
  </resources>