* added SDL include to game c::b project
* add a static instance (EMPTY) to AABB class
* don't copy the returned trace in CL_ParticleRun2
* don't (implicitly) cast float vectors to double and back
* const
* added missing parenthesis - if this is ever going to be a real function...
* made AABB::asIntString safe
* use VectorAbs
* use Q_strvalid
* reduced cyclic complexity in Touch_DoorTrigger
* the default ctor does already exactly that