Realtime Compositor: Make vectors four dimensional

Currently, the realtime compositor treat vector types as 3D vectors,
which is true for most operations. However, some operations deal with
vector types as 4D vectors that encode two 2D vectors or one 3D vector
with the last component ignored. So this patch expands vector types to
include a fourth component that is only sometimes used.

Since we already stored vectors in RGBA textures, the necessary changes
are straightforward and are mostly concerned with adjusting the Result
class.

Differential Revision: https://developer.blender.org/D16359

Reviewed By: Clement Foucault

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