Emmanuele Bassi 5a5b21446c effect: Add BlurEffect
A simple, GLSL shader-based blur effect.

The blur shader is taken straight from the test-shader.c interactive
test case. It's a fairly clunky, inefficient and visually incorrect
implementation of a box blur, but it's all we have right now until I
figure out a way to do multi-pass shading with the current API.
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