OneBlock updates

Ultimate Casino

• Never save storage.yml before it was loaded; keep it complete from boot (#18, #33)
• Claim games before refunding them; clean up failed reveals (#20, #21, #22)
• 🐛 Fix Fix result messaging: raw keys, tax wording, broadcasts, offline results (#23, #27, #28, #29, #34)
• Jackpot: charge the configured bet exactly and show every entrant (#19, #25)
• Let players leave a jackpot pot; admins refund pots and unseat roulette joiners (#26, #30)
• Minor correctness cleanups: an/a, jackpot draw, stats types, pane colours (#31)
• Keep lifetime stats out of the per-bet storage.yml rewrite (#24)
• Address the review nits from the #36–#42 stack (#43)
• Server lottery funded by plugin taxes and ticket sales (#45)