Catch and try to resolve ambiguous boundaries between commands and arguments.

[seisatsu]

In rare cases, for example if you have a command named sit and an alias named sit down which both work on items, as well as an item in the current room named down pillow, the engine needs to figure out that you want to sit on the "down pillow", rather than trying to sit down on a nonexistent "pillow". This becomes more complicated if there is also a second item in the room just named "pillow", because then there are two ways to resolve the ambiguity. In that sort of case, Dennis should give an ambiguity warning and then resolve in favor of the command.