Add the missing libnoise functions

[numeredev]

DESCRIPTION

What does your feature request improve on? Please describe. Libnoise provides three additional noise functions besides perlin(). Add them as well.

Describe the solution you'd like Add the following functions referencing the corresponding noise modules from libnoise:

ridgedmultifractal(x,y,z,freq,octave) -> VAL
billownoise(x,y,z,freq,octave) -> VAL
voronoinoise(x,y,z,freq,freq,displacement,usedistance) -> VAL

https://libnoise.sourceforge.net/docs/classnoise_1_1module_1_1Billow.html https://libnoise.sourceforge.net/docs/classnoise_1_1module_1_1RidgedMulti.html https://libnoise.sourceforge.net/docs/classnoise_1_1module_1_1Voronoi.html

Additional context Add any other context or screenshots about the feature request here.

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DEVS' SECTION

ANALYSIS

Straightforward implementation.

IMPLEMENTATION STEPS

(see also our Wiki for implementation guidelines)

• Implement the necessary changes in a new branch created here on GitHub
• Test your implementation

DOCUMENTATION STEPS

(see also our Wiki for further information)

• Update the changes log
• Add comments to your implementation
• Add Doxygen documentation comments
• Create or update the documentation articles (*.NHLP and *.NDB files, if needed)
• Update the language strings (*.NLNG files, if needed)

PULL REQUEST

• Create a pull request for your changes
• Fill out the template
• Assign @numere-org/maintainers as reviewers