Add tracking for Cataclysm Classic protocol dungeon bags

[rdw-software]

Source: Discord

In Classic Cata they added a lot of mounts to bags you can buy from vendors as well as their normal drop locations

What bags/mounts? Presumably that's something that wasn't in Cata back then? Otherwise Rarity should already support it

No, it's a part of the new protocol dungeons they introduced in classic (Wrath and Cata) to assist in catch-up mechanics

Drop rates (taken from https://discord.com/channels/788119147740790854/1025387509741535374/1339180721591554100):

Stats out of 1493 satchels :

💎 Vitreous Stone Drake: 11 (0,74%)
🌩️ Drake of the North Wind: 11 (0,74%) 
👑 Drake of the South Wind: 10 (0,67%)

Total chance to contain a mount: 2.15%

Items:

• https://www.wowhead.com/cata/item=232947/satchel-of-the-cloudburst-cloak
• (what are the others?)

TBD: Presumably, the bags don't exist on Retail? If so, it might complicate things (more conditional logic? Not great)

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This may require adding support for multiple sources per item if done "properly" (see #160).

Or, you know, we can always add more hacks.