Embed tone mapping filter support

[hshakula]

While working with indoor scenes (like the attic and the esper room) I felt the need to apply tone mapping. So as RIF already has a bunch of tone mapping filter I tested a few of them and selected the most versatile one - Linear Photographic Tone Mapping Filter.

It's possible to add support for more tone mapping filters but I don't feel such need right now

[bsavery]

What reason made you decide this vs the ACES filmic one? The latter is often used as well.

[hshakula]

When I first saw the list of tone mapping filter, I also thought that I would stick to ACES filter but when I tried it and, especially compared it to Linear Photographic, I understood that it's not an option because of how much better I can control the output image with almost the same set of options. The second reason is more subjective - I just liked the output more with this filter, It coincided more with the output which I expect.

As I can see RIF's ACES filter is just fitted curve from here - https://knarkowicz.wordpress.com/2016/01/06/aces-filmic-tone-mapping-curve/
But, as the author states, this curve is not the best choice for realistic rendering