Island World (SkyBlock replacement)

** 8.8 **
* Added support for world border
You will need plugin : https://github.com/yannicklamprecht/WorldBorderAPI

** 8.7 **
* Moved mysql queries into async threads
* Added config option check-only-island

** 8.6 **
* Fixed problem with mysql setup

** 8.5 **
* Display info about leaving island using title

** 8.4 **
* Added getIsland(Location location) to API
* Added getIsland(UUID uuid) to API
* Added support for Minecraft Title when entering island
* Fixed permission for open offline command

** 8.3 **
* Added support for PlaceholderAPI
* Fixed biomechunkset permission check

** 8.2 **
* Added material-default config option
* Fixed problem with incorrect block point calculation
* Added new placeholders

** 8.1 **
* calc-on-enter will use calc-limit config
* Added region-spacings config
* Added islandworld.regionspacing.<> permission
* Added config inv-clear.quitfall - you can clear inventory if player quits from server while falling
* Fixed calc command not couting first layer