Create ability to drop multiple cards in a row (#376)

- Create a `/multidrop` command
  - This will take the price of 10 drops from you and give you 11 cards to sort through
  - You then have a choice to keep the card or sacrifice it
- Create the `multidrop keep` and `multidrop sacrifice` button events

#262

Reviewed-on: #376
Reviewed-by: VylpesTester <tester@vylpes.com>
Co-authored-by: Ethan Lane <ethan@vylpes.com>
Co-committed-by: Ethan Lane <ethan@vylpes.com>

src/buttonEvents/Claim.ts

@@ -58,7 +58,7 @@ export default class Claim extends ButtonEvent {
         if (!inventory) {
             inventory = new Inventory(userId, cardNumber, 1);
         } else {
-            inventory.SetQuantity(inventory.Quantity + 1);
+            inventory.AddQuantity(1);
         }
 
         await inventory.Save(Inventory, inventory);