Graph Clipping: Use Frustum Clipping using AABBox -> Mv transformed Cube -> Frustum mapping + GraphUI Support

AABBox clipping naturally couldn't be transformed into 3D Model-View (Mv) Space,
as it is axis aligned and only provided 2 points (min/max).

Therefor we map the Group's AABBox to a 8-point Cube,
perform the Mv-transformation and then produce the 6-plane Frustum.

As before, we cull fully outside shapes within the Group's draw method
and perform fragment clipping with same Frustum planes in the shader.

With clipping enabled, the 3D z-axis getBounds() depth
will be slightly increased for functional Frustum operation.
This is also done for setFixedSize(Vec2f).

The Frustum planes are copied to the Graph shader
via float[4*6] -> uniform vec4  gcu_ClipFrustum[6]; // L, R, B, T, N, F each {n.x, n.y, n.z, d}

+++

Concludes related work of below commits
- 1040bed4ecc6f4598ea459f1073a9240583fc3c3
- 5cca51e32999a882e2a5f00cb45ecafc824ffd86

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