Tianshou v2 (#1259)

See change log.

Resolves #1091 
Resolves #810 
Resolves #959 
Resolves #898 
Resolves #919 
Resolves #913 
Resolves #948 
Resolves #949
Resolves #1204

v1: bumped version, removed bumpversion [ci skip]

Bumpversion doesn't seem to work properly, maybe it never has worked for tianshou

Dependencies: use release of rliable-fork instead of git dependency

Update publish.yaml, typo [skip ci[

update version to 0.5.0 (#826)

fix info not pass issue in PGPolicy (#787)

close #775

bump version to 0.4.10 (#757)

bump version to 0.4.9 (#684)

Add vecenv wrappers for obs_norm to support running mujoco experiment…

… with envpool (#628)

- add VectorEnvWrapper and VectorEnvNormObs
- obs_rms store in policy save/load
- align mujoco scripts with atari: obs_norm, envpool, wandb and README

rename save_fn to save_best_fn to avoid ambiguity (#575)

This PR also introduces `tianshou.utils.deprecation` for a unified deprecation wrapper.