v4.0.0

• add cg.steal_check, cg.relax_check, and cg.correction_check as convenience methods. These methods call cg.run internally
• don't require Check when using cg.run. cg.run now accepts an iterable of Loadables and a Detect
• provide cvUR as result.ur and ucvUR as result.ucv_ur
• add new Span class, which can be used to represent a range of numbers with a string
• remove num argument to loadables. Use the Span class, or an appropriate string, instead
• remove ischeat from Results and remove thresholds for determining a cheated replay. Users should determine their own threholds and check against Result attributes
• make Detect an IntFlag instead of a full class
• add default load and load_info implementations to LoadableContainer
• don't use Replay.__init__ to process replay data. Use Replay#_process_replay_data instead
• require cache in Loadable instantiation
• add Loader.MAX_MAP_SPAN and Loader.MAX_USER_SPAN, representing the most replays you can get from a map and user respectively