* Add PolyhedronBufferGeometry and subclasses
Added PolyhedronBufferGeometry and the four BufferGeometries subclassing it (TetrahedronBufferGeometry, OctahedronBufferGeometry, DodecahedronBufferGeometry, and IcosahedronBufferGeometry).
* Fix constructors for PolyhedronGeometry subclasses
The PolyhedronGeometry subclasses all have optional parameters for their constructor, but not all the type definitions were in line on this.