Spharpy

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* Bugfix in modal strength calculation for rigid spheres

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* Update equal area partitioning documentation

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* Removed C extensions for spherical harmonics and special functions
* Spherical harmonic basis gradient
* Interior point sampling for eigenvalue stabilization
* Weight calculation for beamforming algorithms
* Added more map projection plots and map data interpolation
* Several bugfixes for plot functions

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* Last release version with C extension
* Refactored C extensions with OpenMP support
* Sampling class
* Spherical Voronoi diagrams

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* Added Geocentric to Cartesian coordinate transform

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* Added Coordinate class object
* New plot functions
* Bugfixes