EssentialsX Selectors: @a, @p, @r (Addon)

This updates adds a few new features, and fixes some bugs that previously existed! Additions:

• Added a team specification for selectors, usage is [team=coolTeam] or [team=!green]. (Check documentation on the spigot page for more info). Important note: The team display name is different from the actual name, make sure to use the actual name of the team when using.
• Added support for all plugins in the EssentialsX franchise. Changed and bug fixes:
• Fixed an issue with the @p selector being used with players in different worlds.
• Changed some default permissions from 'op' to 'true', meaning that every player can use selectors by default.