Distorted Android

Convert Stencil app to the stretch-less API.

Convert DifferentEffects app to the stretch-less API.

Finally, after removing the calculation of the halo from the library and giving this decision to the user, we can update the Triblur app for the new MeshBase.setStretch-less API.

Change the Postprocessing effects: separate the radius and the halo.
Reason: we needed a way to specify the size of the halo around a postprocessed object; before it was automatically (and not very correctly) computed from the radius - before we knew the size of the object's bounding box, so this automatic computation was possible. Now we're removing the MashBase.getBounding(0 API, so the size of the halo has to be explicitly given by the user. This way is more correct anyway and gives the user more control (as the Multiblur app proves!)...

A lot of changes.

1) main vertex shader: remove support for degree_object. This functionality will hopefully come back when we introduce other than circular regions.
2) MeshBase: remove the need to set a Bounding box (this is the point of the whole thing - we wanted to get rid of this so that the advances in MeshJoined will be easier)...

Convert the third app, Transparency, to the new MeshBase.setStretch-less API ( use VertexEffectScale instead )

Convert the second app, Flag, to the new MeshBase.setStretch-less API ( use VertexEffectScale instead )

Convert the first app, Inflate, to the new MeshBase.setStretch-less API ( use VertexEffectScale instead )

fix for centers of Matrix effects.

new VertexEffectShear