shaders: Import shaders from pts/paraview-1.0.3

In addition to removing duplicate shaders from each application, shaders that were the same across applications were removed. All of the shaders from the Wavelet Contour test were the same as the shaders from the Many Spheres test.

I also removed trivial shaders. Each test had several shaders where the vertex shader was just 'gl_Position = mvp * gl_Vertex' and a fragment shader that copied inputs to outputs (possibly with a conditional discard). These kinds of shaders are already well represented in shader-db, IMHO.