Distorted Android

Remove the MeshBase.{set/get}Stretch API altogether.

Fix for a crash when exiting an app:

Activity.onPause() -> MessageSender.stopSending sets mThis to null, then a last message gets sent and a crash in newMessage().

Fix this by

1) making the Message inner class static (so that we can create a new one without a reference to mThis)...

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!)...

Simplify a bit the place where we got a crash once.

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)...

new VertexEffectShear

new VertexEffectScale

bugfix for VertexEffectRotate

new VertexEffectRotate

Add the first two VERTEX 'pseudo-matrix' effects: VERTEX_MOVE & VERTEX_QUATERNION i.e. implementations of those two MATRIX effects in VERTEX queue.

The point(s):

1) preparation for the upcoming MeshBase.preApply(VertexEffect effect) API that's going to supersede the current much more limited MeshBase.apply(MatrixEffect effect)...

Do not crash if we failed to compile some programs.

Do not allow more than 15 characters in the NAME.

Move to AndroidX, target API level 29.

Lower requirements - now only OpenGL ES 3.0 is required; if running on such platform, OIT part of the API ( which is the only one which actually requires 3.1) is switched off.

Progress implementing RubikCube.retObjectString()

Bugfixes in MeshBase:

1) improper buffer was being invalidated after apply and setTextureMap (TFO rather than VBO!)
2) setTextureMap would only work if all components were being set

More support for the 3x3x3 Solver: more of the actual 3x3x3 solver mechanism.

Speedup: only allocate one postprocessing buffer set of the quality we need, not all in one go.

1. library: new API DistortedNode.setProjection()
2. cube: adjustments for Pyraminx.

Fix the memory test - we need to run one thing on the Graphics thread!

Fixes for the Projection matrix, FOV.

There was a confusion between the Projection of the Node onto the Screen, and the Projection of the Cubits on the Node.

Progress with of Pyraminx.
Bugfix for joining a single Mesh!

Improve setTextureMap.

Make MeshBase.setTextureMap() work.

Minor.
Looks like MeshBase.join() actually works.