include more beam weights

[joslloand]

Zotter conveniently offers a variety of additional beam weights here:

Ultraspherical/Gegenbauer polynomials to unify 2D/3D Ambisonic directivity designs

Three* beam weights don't include additional parameters, they could be added to HoaOrder: -beamWeights, and would integrate into the beam weight / beam forming functionality currently implemented.

• [ controlled ]
• [ energy (max-rE) ]
• maxFBR (superCardioid)

*[ controlled and energy are currently implemented via recipes from Daniel ]

A further two beam weights require a parameter adjusting acceptance angle so would require an update to HoaOrder: -beamWeights, or possibly a separate method. (See: https://github.com/ambisonictoolkit/atk-sc3/issues/129)

• maxFlat (Zotter-Butterworth)
• sphereCap