BlockSurvival [Multi-Arena]

· Added a check to make sure that position of arenas are located within the same world. · Fixed an issue where having the global lobby in another world teleported the player to the location of the lobby but not the world. · Fixed an issue with multiple world plugins such as Multiverse not being recognized. · Updated alot of the strings into an easily manageable class for customizeable strings.yml that will be coming in the next version. · Fixed an issue where players could take damage just before entering the arena. · Fixed an issue where the winner could die from fall damage if they fell into the void just after winning the arena. · Updated the arena creation process to use the world of the two positions of the arena rather than the world the command was originally run in. · Changed the range of arena speed from 1 ~ 5 to 0 ~ 10 where the formula is "20 ticks - (difficulty * 2)" with 20 ticks being 1 second.