Refactor Water Shader into Uber Shader #108
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This is the first of several PR's to make enhancements to the current water shader. This first step is converting the water shader into an uber shader to support better performance (only compile shader code that we need) and future enhancements like enabling/disabling reflections/refractions, etc..
Water visuals should not be affected with this change, only changes are under the hood. GLSL code is mostly untouched at this point.
Tested changes on Windows, Linux, HTML, Android