IGCS DoF new features to add

[FransBouma]

• [x] Custom shapes (which influence which points are considered) (Implemented in 2.2.0)
• [ ] Colored shapes (so they influence the color blended)
• [ ] Add an indication for the time to render (framerate * number of frames to render + frames to wait per frame)
• [ ] Add hotkey to start rendering
• [ ] The magnifier should get an optional setting which shows only red or green or blue.
• [ ] Add a way to preserve max bokeh size/highlight settings under a name for quick reselection later on.
• [x] Make sure the IGCSDoF.fx blend factor is set to a value < 0.8. Some people have this set to 1.0. Perhaps we should hide it too? (implemented in 2.2.3)
• [ ] Run the igcsdof shader before the tonemapper pass (using the same technique REST uses), so it'll work on the HDR backbuffer. This will then require it'll skip the SDR->HDR inverse tonemapping and also at the end HDR->SDR tonemapping passes, so it'll let the engine's tonemapper take care of it. Might not result in the results one expects (as it uses the engine's tonemapper) but also could lead to better results (as there's no SDR->HDR upscaling)