This is just a bugfix update with the following fixes:
- Prevents teleportation of a player holding creatures on a leash when handleLeashedCreatures is disabled, to prevent players accidentally losing the creatures during teleportation
- Fixes a potential exception when a gate's open-block or closed-block is set to a material which isn't a block
- Fixes a potential exception when a portal without a sign has an invalid gate type
- Prevents loading of gate files using non-blocks as part of the border
- Prevents a player smuggling another player through a restricted stargate by sitting on a creature held in a lead by the first player