-Add toolbar buttons to switch some rendering options without having to open the options dialog.
--Bug fixes
-Only update summary on render completion, no need to constantly update it.
-Properly handle cancel even on variations dialog.
--Code changes
-Add small function ShutdownAndRecreateFromOptions() to wrap shutting down the timer and recreating the renderer.
-Use the overridden accept() and reject() functions more consistently across dialogs.
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