Fixes, optimizes and adjusts some rendering related things.

* Adjusts specular reflection from torches on the sea water plane
* Increases AO factor for billboards
* Decreases max HDR exposure during the night
* Increases max HDR exposure during the day
* Speeds up HDR exposure adjustment
* Adjusts water tint
* Adjusts water plane when looked at from below (while swimming) - addresses #403
* Adjusts FOV for the rendering of the first person view
* Removes vertex animation from water blocks not on sea level
* Removes reflection from water blocks not on sea level
* Removes timer from HDR exposure update
* Optimizes pixel read operation for the HDR luminance calculation to use BGRA instead of RGBA
* Adjusts water clipping plane - fixes #401