Distorted Android

More support for using the library from more than one activity. Should be working now!

More support for using the library from more than one activity

1) Beginnings of support for using the library from more than one activity
2) rename DistortedLibrary.onCreate() to onSurfaceCreated()
3) (rubik) add Cambodia's flag.

Minor.

Detect if the texture we are trying to upload is too large and return an error.

Remove the 'binding' parameter from the UBO in the vertex shader - this is not part of OpenGL ES 3.0, only introduced in 3.1, and we want to be compatible with 3.0.
Now we need to dynamically detect the UBO index and form a BlockBinding ourselves.

Remove the 'inflate' vertex attributs from the Mesh and file format, and replace that with a per-component 'inflate centers' (which are as of yet untested)

Speedup: remember the mesh associations of VertexEffects only once, when they actually change, and not every time we compute() a VertexQueue.

Simplify AssociationUniformBlock

Move the 'effect association' part of MeshBase to a separate class.