Use GLSL shaders for sprites.

* 2d/sprite.scm: (sprite-vertex): Remove color vertex.
  (r-offset): Delete it.
  (pack-sprite-vertices): Remove logic moved to shader.
  (draw-sprite-vertices): Remove color vertex array rendering.
  (sprite-shader): New variable.
  (<sprite>): Remove dirty field and adjust setters.
  (make-anchor): New procedure.
  (update-sprite-vertices!): Use new 'pack-sprite-vertices'.
  (make-sprite): Use 'make-anchor' and 'update-sprite-vertices!'.
  (dirty-sprite-setter): Delete it.
  (load-sprite): Formatting.
  (sprite-animation-texture): Delete it.
  (drawable-texture): New procedure.
  (sprite-texture): Extract body to 'drawable-texture'.
  (sprite-anchor-vector): Delete it.
  (set-sprite-anchor!): Reimplemented.
  (update-sprite-animator!): Update vertices.
  (draw-sprite): Use shader program.
  (<sprite-batch>, make-sprite-batch, sprite-batch?,
  sprite-batch-max-size, sprite-batch-size, set-sprite-batch-size!,
  sprite-batch-texture, set-sprite-batch-texture!,
  sprite-batch-vertices, sprite-batch-draw, with-sprite-batch): Delete
  all sprite batch code.
* data/Makefile.am (shadersdir, shaders_DATA): New variables.
* data/shaders/sprite-fragment.glsl: New shader.
* data/shaders/sprite-vertex.glsl: New shader.

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