Add a handful of __repr__ methods to improve debuggability

[MajikVroom]

These customize what VSCode (and presumably other debuggers) displays to represent an object. So instead of "<Location.Location object at 0x1234123412341234>", you get "W0 KF Midos Bottom Left Chest with W1 Magic Meter".

Examples of the ones I added:

• World: "W0"
• Goal: "W0 Light Medallion: path to #Phantom Ganon#"
• Item: "W1 Magic Meter"
• Location: "W0 KF Midos Bottom Left Chest with W1 Magic Meter"
• Region: "W0 KF Midos House"

The level of thought that went into these was "this makes sense to me", and I only added them for the types that I happened to be debugging. No idea if this is useful enough to others to be worth putting in as-is, but figured I should at least offer it up.

[MajikVroom]

Note that before Goals hit replace_goal_names, their text may be more like "W0 Fire Medallion: {'replace': 'Fire Medallion'}". Could just suppress the hint_text entirely if it's still in dict form if that's going to bother anyone.

[MajikVroom]

Might also make sense to do __repr__ = __str__ for some of these, if the existing __str__ implementations can be enhanced with the added info. Just not sure if there's anything user-facing based on __str__; I could see a world where spoiler log generation involves stringizing some of these objects.

[cjohnson57]

Good idea to add these