--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/FractoriumSettings.h

@@ -19,6 +19,7 @@
 #define OPENCLDEFILTER       "render/opencldefilter"
 #define CPUSUBBATCH		     "render/cpusubbatch"
 #define OPENCLSUBBATCH	     "render/openclsubbatch"
+#define RANDOMCOUNT			 "render/randomcount"
 
 #define FINALEARLYCLIP       "finalrender/earlyclip"
 #define FINALYAXISUP         "finalrender/finalyaxisup"
@@ -60,6 +61,8 @@
 
 #define UIVARIATIONS		 "ui/variations"
 
+#define STYLETHEME			 "style/theme"
+
 /// <summary>
 /// Class for preserving various program options between
 /// runs of Fractorium. Each of these generally corresponds
@@ -111,6 +114,9 @@ public:
 	uint OpenCLSubBatch();
 	void OpenCLSubBatch(uint i);
 	
+	uint RandomCount();
+	void RandomCount(uint i);
+
 	bool FinalEarlyClip();
 	void FinalEarlyClip(bool b);
 	
@@ -206,4 +212,7 @@ public:
 
 	QMap<QString, QVariant> Variations();
 	void Variations(const QMap<QString, QVariant>& m);
+
+	QString Theme();
+	void Theme(const QString& s);
 };