Revert "Add pucker/bloat modifier"

This reverts commit 4ff761c.

docs/specs/shapes.md

@@ -657,26 +657,3 @@ separately, $start$ and $end$ being applied to each shape.
 * When `m` has a value of `2` (Sequential), all the shapes MUST be considered
 as following each other in render order.  $start$ and $end$ refer to the whole
 length created by concatenating each shape.
-
-
-<h3 id="pucker-bloat">Pucker / Bloat</h3>
-
-{schema_string:shapes/pucker-bloat/description}
-
-{schema_object:shapes/pucker-bloat}
-
-When `a` is `0`, nothing changes.<br/>
-When `a` is positive, the vertices are pulled towards the center, with `100` being at the center. And the tangents are pushed away.<br/>
-When `a` is negative the vertices are pushed away from the center with `100` being twice far away from the center. And the tangents are pulled towards the center.<br/>
-
-The center is defined as the mean of the bezier vertices.
-
-<lottie-playground example="pucker_bloat.json">
-    <form>
-        <input title="Amount" type="range" min="-100" value="50" max="100"/>
-    </form>
-    <json>lottie.layers[0].shapes[0].it[1]</json>
-    <script>
-        lottie.layers[0].shapes[0].it[1].a.k = data["Amount"];
-    </script>
-</lottie-playground>

schema/shapes/all-graphic-elements.json

@@ -13,7 +13,6 @@
         {"$ref": "#/$defs/shapes/stroke"},
         {"$ref": "#/$defs/shapes/transform"},
         {"$ref": "#/$defs/shapes/trim-path"},
-        {"$ref": "#/$defs/shapes/pucker-bloat"},
         {"$ref": "#/$defs/shapes/unknown-shape"}
     ]
 }