Working on uniforms, I realized that there was a large
amount of code duplication in the applyUniform* functions,
so I create a basic applyUniform() to contain common code
between all these functions, which reduces the size of
Program.cpp by about 275 lines, or about 10% of that file.

Change-Id: I0f013821e1cc8f507bb4d6829b0097fc41420e6d
Reviewed-on: https://swiftshader-review.googlesource.com/4527Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>