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This new version performs better and has a better API. It closely
resembles Love2D's sprite batch API.
* chickadee/render/sprite.scm (with-batched-sprites,
sprite-batch-reset!, sprite-batch-begin!,
draw-sprite-batched, *batch?*, %batch): Delete.
(draw-sprite-unbatched): Rename to 'draw-sprite*'.
(<sprite-batch>)[index-buffer, position-buffer, texture-buffer]:
Delete fields.
[vertex-buffer]: New field.
(init-sprite-batch, double-sprite-batch-size!, sprite-batch-add!,
sprite-batch-flush!): Rewrite.
(make-sprite-batch): Add 'capacity' and 'blend-mode' arguments.
(draw-sprite-batch): New procedure.
(draw-nine-patch*): Stop using sprite batches for now.
* chickadee/render/font.scm: (<font>)[sprite-batches]: New field.
(load-tile-font, load-font): Create a sprite batch for each texture
loaded.
(draw-text*): Use sprite batches.
* chickadee/render/tiled.scm: (<tile>)[batch]: New field.
(<tileset>)[batch]: New field.
(load-tile-map): Create a sprite batch for each tileset.
(draw-tile-layer): Use new sprite batch API.
(draw-tile-map*): Remove reference to deleted macro.
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