Check name scoping when parsing a logic

[aspiwack]

The goal is to make sure to avoid typos in names of items, etc…

So instead of blindly add everything we see to the logic's list of item and locations (and risk having a "progressive sword" and a "porgessive sword" in our item list), we first gather the items and locations which will be allowed in the logic, and, produce an error when an undeclared item or locations is used.

Range formulas are probably ok, for the time being, to declare items. We also need a way to declare locations.