General Changes:
- Changed the /showtoast Command from /showtoast <Player> <Icon> <Message> to /showtoast <Player> <Icon> [Frame] <Message> to now be able to set which Frame should be used in the Toast, however this Argument is optional which means Commands from prior versions still work (so you don't have to update your command blocks)
- You can now ommit the flags in JSON Advancements instead of having an empty array if you don't want any flags

API Changes:
- Added VisibilityAdvancementsPacket class, which works just like the AdvancementsPacket but strips Advancements from the packet which are not visible to the Player

Bug Fixes:
- If a Folder with the same Name as a Save File exists, it will be deleted if it's empty or an error will be thrown if it is not empty
- Progress will now be unloaded upon leaving the Server for Advancements added through JSON
- Fixed Typo in Permission Message
- Fixed Save Files not being loaded if criteria or progress data was missing instead of empty