Distorted Android

Further fixes for the new fully 3D vertex region.

Redefine the Vertex Region from (x,y,r,unused) to (x,y,z,r). This takes into account the 'Z', which makes it possible to warp only one side of a 3D Mesh like Sphere.

Also corresponding changes in applications.

Simplify MeshSphere by deriving it not from a regular icosahedron (which has a problem of a wiggly seam line at the 'change of date' in the back of the sphere) but something that at the back has a straight vertical border between triangles: a diamond-like 16-faced solid.

Make Matrix effects Rotate and Quaternion actually correct when it comes to the Z-axis. Also corresponding adjustments in apps.

Sphere: map the texture a bit better around the seam and the poles.

Fix (hopefully the last!) probelm with texturing the Sphere: the seam in the back.

One more improvement with texturing the Sphere.

Still one problem with texturing remains.

Further fix for the Sphere. Now hopefully only the texture mapping is wrong.

Some fixes for Sphere; still not completely ok though.

Add support for MeshSphere (add ability to display it in the 'Effects3D' and 'Inflate' apps).
Still a bit buggy!