0.9.5_10340 📬 Invite Mailbox Notification, Stability Fixes

• Mailbox will now notify you when you have an invite that you haven't responded to
  
• Fixed crashes that could happen when using the Builder's Kit
  
• Fixed issue where sometimes dropped items won't be picked up the first time
  
• Changed sound effect on item hold - it could sound like some cats hacking up a hairball from the other room... As cat owners, we understand this panic