Large overhaul of the fighting system. ...

Removed the 'weapon' object type, changed 'equip' to 'hold'
and implemented some minor UI changes.

Added command function aliases. ...

Also updated the documentation.

Added Christopher Robin's house and fixed several bugs in the world.

Implemented autosaving. ...

Also rewrote the game loop and fixed some bugs.

Quite a bit of refactoring in ui.lisp