Safe setter for uniforms

[nikrowell]

Thanks for releasing NanoGL - I've really enjoyed experimenting with it recently! I love the convenient uniform setters on programs, but occasionally I'll use something like gl_FragColor = vec4(1.0, 0, 0, 1); in my shaders to debug something, but that throws an error with program.u_whatever is not a function.

To get around this, I'll often wrap my programs in their own class with a method:

uniforms(uniforms) {
  this.program.use();
  for(let name in uniforms) {
    let setter = this.program[name];
    if(setter === undefined) continue;
    setter(uniforms[name]);
  }
  return this;
}

Useful addition to NanoGL's Program module?