Rebuild the foliage with leaf cards: leafier silhouette at two thirds the triangles

CHANGELOG.md

@@ -8,6 +8,11 @@ Semantic Versioning.
 
 ### Changed
 
+- Street greenery now reads as leaves instead of green rocks: the planter shrubs and tree crowns
+  are built from leaf cards, which also cut their triangle count by about a third.
+
+### Changed
+
 - Removed every hat and hood from the NPC roster: the firefighter helmet is the only head gear
   left, so no character hides its face behind a cap. The street performer no longer wears the
   cone hat and carries the baton and board in the hands instead.