Feature Request: Bumpwater using engine uniform buffer sun so it tracks sun position changes.

Currently, bumpwater uses #define'd SUNDIR, instead of engine uniform buffers. For dynamic sun, it would be ideal if bumpwater shader wouldnt have to be recompiled for each change.

Some other constants are:
fogColor
fogParams
GLSLDefineConstf1(definitions, "shadowDensity", sunLighting->groundShadowDensity);

Thank you very much!

Search the bumpwater shader for the SUNDIR definition, then inspect how engine uniform buffers expose values such as fogColor and fogParams. Done means bumpwater reads sun direction through an engine uniform buffer so sun position changes no longer require shader recompilation.

Written by the indexing model from the issue text.