LogEvent -> LogEvents
Fixed warnings
Pushed source and activator arguments into the appropriate Ability fields
Language pragma to make Haddock happy
Export LastKnownObjectInfo
Added todo
Removed helper function objectTypes
Removed labels for ObjectTypes and Ability
Quick and dirty Show instances for Object, Event, ContinuousEffect
Improved describeEvent
Fixed bug in planeswalkerType
describeEvent PlayLand
Introduced event sources; temporarily disabled replacement effects