--User changes

-Add a new dialog for editing QSS stylesheets. Allow for saving, reloading and setting styles as default.
  --Include a dark style with the installation called dark.qss.
  --Also add support for themes such as Fusion.
  --Resize some controls to better fit with the new style.
 -Add an option to specify the number of random embers generated on startup. 1 is the minimum and the default.

--Bug fixes
 -Properly enable/disable thread priority label in final render dialog in response to enable/disable of the OpenCL checkbox.
 -Remove all inline stylesheets.
 -Show xaos spinners with 6 decimal places.

--Code changes
 -Remove redundant comparisons to nullptr, use ! instead;
 -Give some controls valid names instead of the auto generated ones.
 -DoubleSpinBoxTableItemDelegate.h: Add virtual keyword to overridden functions.

Source/Fractorium/AboutDialog.ui

@@ -58,7 +58,7 @@
     <enum>QFrame::NoFrame</enum>
    </property>
    <property name="text">
-    <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p align=&quot;center&quot;&gt;&lt;br/&gt;Fractorium 0.9.9.1 Beta&lt;/p&gt;&lt;p align=&quot;center&quot;&gt;&lt;span style=&quot; font-size:10pt;&quot;&gt;A Qt-based fractal flame editor which uses a C++ re-write of the flam3 algorithm named Ember and a GPU capable version named EmberCL which implements a portion of the cuburn algorithm in OpenCL.&lt;/span&gt;&lt;/p&gt;&lt;p align=&quot;center&quot;&gt;&lt;span style=&quot; font-size:10pt;&quot;&gt;Lead: Matt Feemster&lt;br/&gt;Contributors: Simon Detheridge&lt;/span&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+    <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p align=&quot;center&quot;&gt;&lt;br/&gt;Fractorium 0.9.9.2 Beta&lt;/p&gt;&lt;p align=&quot;center&quot;&gt;&lt;span style=&quot; font-size:10pt;&quot;&gt;A Qt-based fractal flame editor which uses a C++ re-write of the flam3 algorithm named Ember and a GPU capable version named EmberCL which implements a portion of the cuburn algorithm in OpenCL.&lt;/span&gt;&lt;/p&gt;&lt;p align=&quot;center&quot;&gt;&lt;span style=&quot; font-size:10pt;&quot;&gt;Lead: Matt Feemster&lt;br/&gt;Contributors: Simon Detheridge&lt;/span&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
    </property>
    <property name="textFormat">
     <enum>Qt::RichText</enum>
@@ -85,7 +85,7 @@
      <height>483</height>
     </rect>
    </property>
-   <layout class="QVBoxLayout" name="verticalLayout_4">
+   <layout class="QVBoxLayout" name="AboutVerticalLayout">
     <item>
      <widget class="QGroupBox" name="CodeCopiedGroupBox">
       <property name="sizePolicy">
@@ -246,12 +246,12 @@
      </widget>
     </item>
     <item>
-     <layout class="QGridLayout" name="gridLayout" rowminimumheight="0">
+     <layout class="QGridLayout" name="AboutOkGridLayout" rowminimumheight="0">
       <property name="verticalSpacing">
        <number>6</number>
       </property>
       <item row="0" column="0">
-       <widget class="QPushButton" name="okButton">
+       <widget class="QPushButton" name="OkButton">
         <property name="minimumSize">
          <size>
           <width>100</width>
@@ -277,7 +277,7 @@
  <resources/>
  <connections>
   <connection>
-   <sender>okButton</sender>
+   <sender>OkButton</sender>
    <signal>clicked()</signal>
    <receiver>AboutDialog</receiver>
    <slot>accept()</slot>