Async Collector execution
This release major upgrades is a patch to collector.start() to allow collectors (single or multi-proc) to run asynchronously. #2935
An example is provided in the async SAC example. #2946
Single-agent reset
Fixes #2958 where partial resets are not handled correctly when a BatchedEnv is transformed - as the "done" checks were inconsistent. We now enforce that root "_reset" entries always precede their respective leaves.
Fix shifted values in GAE using LSTMs
Using an LSTM within GAE is facilitated by ensuring that shifted=True and shifted=False work properly (with appropriate warnings/errors if other hyperparameters need to be set). #2941
Full Changelog: v0.8.0...v0.8.1