fixed deprecated neo_proto and bug with phsyx cfg

[JeliPenguin]

Regarding the issue #4 with training for forward locomotion and having all runs fail, after checking the logs, I have located the following issues:

• neo_proto is deprecated thus should be removed
• cfg.sim.physx should be wrapped around vars(cfg.sim.physx)
• Numpy deprecated np.float in 1.20, which is used in isaac gym preview 4, thus numpy version must be <1.20

[Indiasuperman]

thanks for your help

[Indiasuperman]

I modify the neo_proto and phsyx cfg, install numpy 1.19. unlucky, I still have the problem ( lol

[sweetdog123]

@Indiasuperman numpy 1.20 may be