-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.
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