Enable Rarity to be used on Classic realms

[rdw-software]

Follow-up to #132. If Blizzard forces everyone into Cataclysm "classic" then demand for this may be lower. But if WOTLK gets a perpetual ("Era") realm them I can see a lot of people wanting to play there at least occasionally, and collect stuff?

Not sure how useful this would be after all this time. Depends on community feedback, I guess?

As a starting point, this might be used: https://github.com/WilliamHarer/Raritywrath

Roadmap:

• Determine what API differences exist between WOTLK classic and Retail clients
• Research how the multiple-TOC thing works (probably just copy/paste?)
• Research how other (popular) addons handle their classic version differences
• Figure out which of Rarity's features should be turned off in WOTLK
• Abstract those parts, clean them up if needed, and implement a second interface for classic (TBD)
• The item database needs to be filtered (tricky, since WOTLK category items may have been added after the fact?)
• Rest TBD (don't know what else needs doing at this point(

[eTzmNcbkrng]

Keen, watching.

[beren12]

Sorry. With cata dropped maybe the API is closer?

[rdw-software]

Haven't looked into Cataclysm at all, but a quick search yields a few generic wiki articles that might still be applicable:

• https://warcraft.wiki.gg/wiki/Porting_addons_to_Classic
• https://warcraft.wiki.gg/wiki/Patch_1.13.2/API_changes

Unfortunately, there's no complete list or other "official" documentation for API differences, so trial and error may be required.