Optimized rasterizing of paths using stencil method in GL 2 engine.

Making the triangle fan of each sub path start at the sub path's
centroid will on average improve performance for complex paths, because
less pixels that are outside the path need to be touched. The centroid
is a more balanced choice than just picking the first element of the
sub path as triangle fan origin.

A performance improvement of 20 % was measured for star formed paths.

Reviewed-by: Trond

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