Use a single default shader for all meshes.

* data/shaders/default-fragment.glsl: New file.
* data/shaders/default-vertex.glsl: New file.
* data/shaders/font-fragment.glsl: Delete.
* data/shaders/font-vertex.glsl: Delete.
* data/shaders/sprite-fragment.glsl: Delete.
* data/shaders/sprite-vertex.glsl: Delete.
* examples/common.scm: Remove call to enable-sprites.
* sly/font.scm (font-shader): Delete.
  (enable-fonts): Remove shader loading.
  (make-label): Use default shader.
* sly/shape.scm (make-cube): Make texture and shader optional keyword
  arguments.
* sly/sprite.scm (sprite-shader, enable-sprites): Delete.
  (make-sprite): Make shader an optional keyword argument.

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