DGN pymarl - Implementation of DGN on Pymarl, which could be trained by VDN or QMIX

This is the implementation of DGN on Pymarl, which could be trained by VDN or QMIX.

python3 src/main.py --config=vdn --env-config=sc2 with comm_flag=1.0

python3 src/main.py --config=qmix --env-config=sc2 with comm_flag=1.0

In the costumed starcraft.py, we decrease the sight range and communication range.