render: sprite: batch: Combine vertices and texcoords into one buffer.

Not sure how much of a gain this is, but it's one less buffer to map
each frame.

* chickadee/render/sprite.scm (init-sprite-batch): Create combined
vertex/texcoord buffer.
(double-sprite-batch-size!): Map and copy only a single buffer.
(sprite-batch-begin!): Map just one buffer.
(sprite-batch-add!): Use new packed buffer layout.

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