RendererBase: Add ComputeCamera() as a virtual function. Add strips parameter to TotalIterCount().
Renderer: Implement ComputeCamera() as an override.
SpatialFilter: Ensure filters that are too small are made large enough to create.
FinalRenderDialog: Add estimated iters table row and populate on all UI updates.
FractoriumParams: Zoom was not being saved, loaded. Fixed.
GLWidget: Prevent mouse wheel event from being passed to the scroll bars. It should only affect the scale.