Gym Improvement for LFP Training

[frank-qcd-qk]

• Added option where if you provide a valid file path to map_name, it will load the map using the full filepath

env = DuckietownEnv(map_name="/home/duckie/mymap.yaml")

• Added option random_pos for Duckie Object where it will allow random spawning

  duckie1:
  kind: duckie
  pos: [3.5, 1.2]
  rotate: 10
  height: 0.06
  random_pos: True