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qt: introduce `QSGRectangularNoiseNode` that uses proper blend factors

Fatih Uzunoğlurequested to merge
fuzun/vlc:qt/qsgrectangularnoisenode into master

Depends on !6477 (merged).

Advantages:

  • ShaderEffect seems to create a dummy texture when there is no texture provided. Although it is not sampled in the noise fragment shader, it is still waste of resources.
  • We want to use blend factors (One, One) instead of the default (One, OneMinusSrcAlpha) of the scene graph renderer. ShaderEffect does not allow adjusting these.

Disadvantages:

  • Not as simple as using ShaderEffect.

Request review @chub. If the noise is still different, the cause must not be about blending.

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