Various fixes

[illwieckz]

Fix various stuff, either because it's buggy to begin with, or because it would look better with new build options.

• Some lights stuck in ceiling. Because of technical reasons the backsplash was painted but the emitted light itself wasn't and the surface wasn't visible, as it was stuck in geometry.

Before:

After:

• A surface was mistakenly caulked, not visible by most players while in action, but small aliens like dretches can easily sport it.

Before:

After:

• Some light backsplash were dimmed, basically to fit some newer build options

Before:

After:

For reference, here is how it looks in 0.55.5:

That 0.55.5 screenshot is not using tone mapping because tone mapping wasn't properly calibrated for Unvanquished needs yet, while all the other screenshots above are using tone mapping and the latest for-0.56.0/sync branch. So when comparing, keep that in mind that tone mapping contrast darkens images a bit, despite us having nerfed the contrast.

As a remind, here it how it looks on 0.55.5 with tone mapping enabled but with such tone mapping not being calibrated for our needs yet (over exposure being a byproduct of that, and contrast could not hide it anyway). It is now up to the one wanting to reproduce this look on his end to crank exposure up:

That last screenshot isn't usable for comparison. See those threads on calibrating the tone mapper:

• Finding a good toneMapping profile DaemonEngine/Daemon#1865
• Improve how the tone mapper interacts with the linear pipeline DaemonEngine/Daemon#1913
• tr_init: recalibrate the default tone mapper preset DaemonEngine/Daemon#1884
• cameraEffects: do the tone mapping operation before the color conversion DaemonEngine/Daemon#1912
• Beautifying the tone mapped render DaemonEngine/Daemon#1915

Now with all those fixes the lighting is more reliable making easier for people to tweak them as they like on their side with engine options thanks for now having a solid base to start from.

[slipher]

I haven't really checked anything but sounds good.