Minor bug fixes and improved env_player.reset

This release adds:

• handling of -swapsideconditions messages
• log.info /log pm messages instead of log.warning them
• Fix hidden power Moves initialization - their type is now correctly inferred
• Fix hanging env_player.reset when called before the current battle is finished
• env_player.complete_current_battle now forfeits instead of performing random moves until the battle finishes
• env_player.step(-1) forfeits the battle