[Bf-cycles] Normalized Emission shader

[Marco G]

Hi members,

months ago a feature regarding the Emission node has been removed, the
problem is that it was never exposed to the UI but actually pretty useful,
so i'm writing to ask to bring it back if possible and if other members
agree.

With this option enabled the total amount of emitted light is the same
regardless of the mesh size. (it would still be optional of course).
Biggest advantage it would be that once you're satisfied with how much
light you have in your scene you can resize the light without affecting its
power, for example to make it bigger to soften shadows or get bigger
reflections, without the need to adjust the strenght since it would stay
equal.

If reimplemented, maybe a flag "Normalize" exposed in the emission node
would do the job?
Tooltip: "If checked, the total amount of emitted light is the same
regardless of the mesh size"

Opinions?

Thanks,
MG
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