Add variadic functions

[NicoHood]

See https://github.com/arduino/Arduino/issues/3546

Example code:

  Serial.println("1",  "2", 6, "3"," Word " , "4", '!', "5");
  Serial.println();
  Serial.println(44, 44, 44);
  Serial.println();
  Serial.println(44, HEX);
  Serial.println();

// this produces the same flash size:
  // Serial.println("1", "2", "3", "4", "5");
  Serial.println("1");
  Serial.println("2");
  Serial.println("3");
  Serial.println("4");
  Serial.println("5");

[Chris--A]

//If you input only two integers the formatted
// Functions have higher priority

There is a lot of ambiguity as the second parameter means two different things depending on the total number of items, rather than the type of inputs. This should be modified to allow standard overload selection/deduction semantics.

One method of fixing this requires the formatting elements to be enums which will remove all ambiguity.

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