v2.1.1

Changed

• Added COLLECTIVE_RETURN to PERMITTED_OBSERVATIONS.
• Split install.sh into three scripts.
• Move from yapf to black.
• Remove debug observations to speed up environment stepping.

Fixed

• Add Lua 5.2 compatibility for unpack.

Removed

• SubstrateWrappers previously needed for the v1 bots.

Added

• Colab for visualizing evaluation results.
• Tests for the examples.
• Mocks of specific substrates and scenarios, for use in testing.
• Helper for setting world.rgb spec.