Wart suggestion: MapPartial

[froth]

I suggest adding a MapPartial Wart similar to OptionPartial and TryPartial. I t should prevent calling the apply method on a Map instance which can throw a java.util.NoSuchElementException.

I tried doing it myself, but I really struggle with the macro syntax. I think that it should be straight forward for someone more experienced in macros.

  test("can't use Map#apply") {
    val result = WartTestTraverser(MapPartial) {
      println(Map(1 -> "")(1))
    }
    assertError(result)("Map#apply is disabled - use Map#getOrElse instead")
  }