Added support for stashes

Generalized the commit dialog to support stashes
Parameters are now quoted in the log if necessary
Fixed another issue with the folderview show/hide logic
Various minor ui tweaks

FossilOrigin-Name: ce70efe67a1fe0087cc6d3aa79757a5011c57db2

CommitDialog.ui

@@ -23,6 +23,9 @@
    <item>
     <widget class="QComboBox" name="comboBox"/>
    </item>
+   <item>
+    <widget class="QLineEdit" name="lineEdit"/>
+   </item>
    <item>
     <widget class="QSplitter" name="splitter">
      <property name="orientation">
@@ -58,6 +61,13 @@
      </widget>
     </widget>
    </item>
+   <item>
+    <widget class="QCheckBox" name="checkBox">
+     <property name="text">
+      <string>CheckBox</string>
+     </property>
+    </widget>
+   </item>
    <item>
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="orientation">