Doom - Same Action Space Across Environments (#157)

* Doom - Added reward_threshold and timestep_limit for all environments

* Doom - Returning all available game variables

* Doom - Moved _seed to doom_env to avoid repetition in every environment

* Doom - Added ALT_ATTACK and made all action_space equivalent (same controls between environments).

* Doom - Actions can either be a short list of allowed actions or the full list of 41 commands

* Doom - Returning black observation space on error or is_finished, rather than empty list (which was triggering an error)

* Doom - HighLow.sample() returns the small list.

* Doom - Updated difficulty for some missions

* Doom - Fixed inconsistency between controls.md and deathmatch.cfg

* Doom - Issue #168 - Remove sleep statement from DoomEnv render

* Doom - Only using full action space (43 keys)

- Added 'normal', 'fast' and 'human' mode
- Set non-deterministic to True
- Set video.frames_per_second to 35
- Properly returning game variables

* Replaced warnings.warn by logger.warn

* Doom - Added NUM_ACTIONS and action_idx instead of x

* Doom - Added NUM_ACTIONS and action_idx instead of x

* Doom - reset() only calls game.new_episode() after first call

* Doom is now deterministic

* Doom - Partial fix for issue #167 - DoomDeathmatch environment crashes sporadically

* Doom - Standardized envs, simplified _reset

* Doom - Removed temporary fix for issue #167

* Doom - Added scoreboard summary and description

gym/spaces/discrete.py

@@ -1,6 +1,6 @@
 import numpy as np
 
-import gym
+import gym, time
 from gym.spaces import prng
 
 class Discrete(gym.Space):