[RELEASED] for UE4: Complete Sky and Weather System

@**nacho_simul Water actors is good job, but there are some shortcomings I think.
For example, the fresnel(or reflection?) effect of water is too strong, causing the distant sea surface to be luminous.If it is the fresnel make so bright, the output of the Finel function should be 1-X. I don’t know will simul provide water material ,but I really want to edit it.
in addition, i want to know will simul’s water support buoyant, water flower interaction and shoreline **