fix some cppcheck warnings
Properly handle unlit object.
STKMesh: Implement (single) texture detail support for objectpass shaded objects.
Fix attempt for black objects.
Merge pull request #12 from KroArtem/master

fix some cppcheck warnings
Bunch of small code cleanup
Properly fixed position of physical bodies when they are animated
(thanks to auria).
My tweaks to SSAO, to improve randomness and final blending
Fixed missing collisions in mansionl (caused by negative default mass
for objects). Added assert to bullet to catch this kind of problem early.
Lightprepass: Handle skybox ourselves
SSAO: Use sampling points proposed by Auria.
GPUParticles: Force alpha additive for flip particles
SSAO: Improve randomness using NEAREST filtering
SSAO: Remove the strenght parameter
SSAO: Fix typo and use 16 samples
Revert "SSAO: Remove the strenght parameter"

This reverts commit b92f0b6eccdcff209d5fdabaeb4efc2ae6f3a68c.
SSAO: Disable alpha test and simplify code
SSAO: Actually simplifying code was a mistake.
Reset skybox texture when loading track.
Fix harmless GCC warning