-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.
-Add variations filter/selection dialog.
--Bug fixes
-Fix summary window not properly indicating the presence of pose affine.
-Remove a file named Fractorium.aps which had been erroneously committed a year ago.
--Code changes
-Use qobject_cast instead of dynamic_cast where appropriate.
-Add more override keyword where appropriate.
-Add variations list to settings for filter dialog.
