Added option to have TriggerParent accept mounted players. Turned it on for WorkCart and Cargo Ship. Being mounting inside the trigger lets a player dismount in local trigger-space, which means client and server will sync up. Otherwise the client/server delay can have them dismounting into invalid space. I had previously added "unparentOnMount" to BaseMountable as an option for the Cargo Ship microphone to fix the same bug. Refactored it to the new system; it can just check whether the trigger has parentMountedPlayers set to true now.