Added vault support.
core.balance(Player) // (Player) Get the player's current balance (in double)
core.deposit(Player, double) // (Player) the player to deposit (double) the amount to deposit (will return boolean -> false if failed, true if succeeded)
core.withdraw(Player, double) // (Player) the player to withdraw (double) the amount to withdraw (will return boolean -> false if failed, true if succeeded)