simple demos including: ur5 control in pybullet, virtual camera perception from end effector

run python environment.py to see control and perception demo.

requirements:

opencv_python==4.5.1.48
scipy==1.5.2
numpy==1.19.2
pybullet==3.1.2
open3d==0.12.0

opengl camera perception refers to https://github.com/ethz-asl/vgn.git