v0.8.0

This release provides support for randomly planting various
types of trees in a somewhat pleasing fashion.

• feat: tree stamp (#54, #56)
• feat: plant a large area (#58, #59)
• fix: add forgotten cos & sin, fiddle with density (#60)
• refactor: auto load image cache (#57)
• refactor: sample tree params into an Object (#55)
• refactor: preload order in StampedScene