Write a class for converting between different currencies. The class should be immutable. Create a single constructor that takes a double value and a string representing the currency. Write a getter that take a currency type string and returns the value in that currency as a double. Include currencies for USD, EUR, JPY, GBP, CAD, CNY, RUB, MXN, AUD, INR and Bitcoin (XBT). Have a method for setting the current conversion rates by passing a map. Also have a toString() like method that takes a currency code and then returns the value formatted with its currency symbol.

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