Geometry Batching

Geometry Batching

DALi support to batch geometry under certain conditions ( like using same texture atlas, shaders ).

Known limitations:
- Batching, once it's on, is immutable
- Batches update only, when something changes in the hierarchy
- Actors within a batch share the same uniforms set ( share values like opacity, color etc. ).
- Transformations applied to actors within a batch won't have any visual effect.

Change-Id: Id48aa47397b8ff9169dc044f37e4de2341a6b169