Depth of Field Improvements

I spent more time this month iterating on the depth of field to make it look better and perform better. A few changes to post-processing were done to allow for this to happen, you now can run post-processing before & after tone mapping allowing you to use a full HDR buffer or an 8-bit buffer. A lot of the DOF options were trimmed down to improve its ease of use, it's now running on the HDR buffer, has bokeh filling & is a lot softer.