--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/Ember/Variation.h

@@ -1874,7 +1874,7 @@ protected:
 #define VARCOPYDOUBLE(name) \
 	virtual void Copy(Variation<double>*& var) const override \
 	{ \
-		if (var != nullptr) \
+		if (var) \
 			delete var; \
 		\
 		var = new name<double>(*this); \
@@ -1905,7 +1905,7 @@ protected:
 	\
 	virtual void Copy(Variation<float>*& var) const override \
 	{ \
-		if (var != nullptr) \
+		if (var) \
 			delete var; \
 		\
 		var = new name<float>(*this); \
@@ -1932,7 +1932,7 @@ protected:
 	\
 	virtual void Copy(Variation<float>*& var) const override \
 	{ \
-		if (var != nullptr) \
+		if (var) \
 			delete var; \
 		\
 		var = new name<float>(*this); \
@@ -2018,7 +2018,7 @@ protected:
 	\
 	virtual void Copy(Variation<float>*& var) const override \
 	{ \
-		if (var != nullptr) \
+		if (var) \
 			delete var; \
 		\
 		var = new name<float>(*this); \
@@ -2049,7 +2049,7 @@ protected:
 	\
 	virtual void Copy(Variation<float>*& var) const override \
 	{ \
-		if (var != nullptr) \
+		if (var) \
 			delete var; \
 		\
 		var = new name<float>(*this); \