-Allow for saving EXR as full 31-bit float per component per pixel.
-Allow for saving the output from the final render dialog as a different image format without starting the rendering process over.
--Code changes:
-Make StripsRender() handle memsetting the final output image so calling code no longer has to.
-Make FinalRenderEmberController<T>::SaveCurrentRender() return the path that the image was actually saved to.
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