Use an header included in every shaders.
Forget a shader + remove shader output
Add screen fallback in case no ubo are here.
Ignore minor logging spammed by recent nvidia drivers
Disable shadows when UBOs are off
Fix previous commit about shadows vs UBOs, had forgotten shadows is an int and not a bool
more video settings fixes
Add option to randomize particles start position, and use it on snow, so that snow falls more evenly
Merge branch 'master' of https://github.com/supertuxkart/stk-code into ScriptEngine