Realistic Fluids Simulation

Realistic Fluids 1.0.1

- Water is much easier to see now. It has a clear blue tint, gets darker and more opaque with depth, and the surface reflects a bit more. You can still see the ground through shallow water.
- The underwater view uses the same bluer water colour.
- Better error reporting for graphics problems:
  - The log now records your graphics card, driver and OpenGL version.
  - OpenGL errors are logged together with the rendering step that caused them.
  - If the fluid renderer cannot run on your graphics card, a chat message tells you.
- /realisticfluids reload now also restarts the fluid renderer after a graphics error.

If the fluids do not show up for you, please post your logs/latest.log in the comments or issues. It helps to find the cause on your graphics card.