Index Java annotations correctly

[kiritsuku]

scalac simply treats Java annotations differently than Scala annotations. If we can't extract the information we have to fix it in the compiler, which we don't want to do. Test cases (for ScalacConverterTest):

  @Test
  def java_annotation_with_argument_of_name_value() = {
    convert(
    "x.scala" → """
      @Ann(Constants.C)
      class X
      object Constants {
        final val C = 0
      }
    """,
    "Ann.java" → """
      public @interface Ann {
        int value();
      }
      class XXX {
        void xxx() {
          int i = 0;
          System.out.println(i);
        }
      }
    """) === Set(
        "X", "Constants", "Constants.C", "<ref>Ann", "<ref>Constants", "Constants.<ref>C")
  }

  @Test
  def java_annotation_with_argument() = {
    convert(
    "x.scala" → """
      @Ann(v1 = Constants.C)
      class X
      object Constants {
        final val C = 0
      }
    """,
    "Ann.java" → """
      public @interface Ann {
        int v1();
      }
    """) === Set(
        "X", "Constants", "Constants.C", "<ref>Ann", "<ref>Constants", "Constants.<ref>C", "Ann.<ref>v1")
  }