Implement copying and pasting xforms between flames.
--Code changes
Make palette filename be a shared_ptr<string> to avoid duplication.
Ensure random seeds in RendererCL have no duplicates and are not zero.
Carry logic from this fix to writing Xform Xmls as well.
Motion was not supported on some Xform fields as it was originally copied from flam3. Allow it on all but xaos now.
Fix clamping range for m_ColorSpeed at the end of ApplyMotion() to match the values we accept elsewhere.
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.
