Option to not save junk denoise layers to EXR

Currently V-ray offers no way to choose which channels go into an EXR when we add a denoiser render element. Therefore compressed EXR's that could be a much needed 5-7mb suddenly bloat out to 40-50mb which is a massive drain on both hard drive space and file syncing online.

I propose the user has an option to only save the effects result channel when adding a denoiser render element so as to keep post lean and fast. Time is money!