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