Adding VanishXServer module for VNP support across servers
* Supports:
  * Silent join: vanish.silentjoin.global
  * Fake join/quit
  * Vanish state across servers
* Issues:
  * fake join/quit state not kept across servers
  * Global join/quit messages not prevented
VanishXServer changes:
* Fake online status is now updated correctly
* Join message is hidden on silent join
* Quit message is hidden if vanished player is not "online"