Use collectibles for displayProperties on redacted items

[joshhunt]

Most redacted items have Collectibles that are not redacted. This PR uses them for displayProperties of name, icon and description where they can be used. It still doesn't let us equip the item or determine its power, but at least the item is now searchable and provides a bit more context.

I also had to make a change to LazyDefinition to support getting all definitions of a type (because I need to key Collectibles by itemHash). I hope this is okay and I've done it correctly 😇

[bhollis]

@joshhunt I tweaked it a bit, mostly just so we don't load everything unless we have to, and so we keep track of what we've loaded so subsequent get calls don't need to reload what's already been loaded. Would you mind trying it out and making sure it works before I merge, since I don't have any redacted items?

[delphiactual]

We may also want to do something to the tile besides the ??? to highlight that this item is classified at a glance.

Edit:
Especially if Bungie-net/api#138 ever sees the light of day

[joshhunt]

@bhollis I've updated it a bit and given in a whirl and everything looks good from here...