Improve Java highlighting

[chbk]

This PR makes Java highlighting more consistent with other languages.

Release Notes:

• Improved Java highlighting

Java 6.0.3	With this PR

@interface Annotation {
  String value() default "value";
}
interface Interface {
  public String message();
}
class Test implements Interface {
  @Annotation(value="test")
  public String message() {
    String string;
    String nothing = null;
    String formatted = STR."string: \{nothing}";
    return formatted;
  }
}
class Main {
  public static void main(String[] args) {
    Test test = new Test();
    System.out.println(test.message());
  }
}

• Annotation: type -> attribute, as in Python, Java itself
• @: punctuation as in Python, JavaScript, etc.
• null: type -> constant.builtin, as in JavaScript, Go, etc.
• new: operator -> keyword.operator as in JavaScript, C++, etc.
• \{ }: string.special.symbol -> punctuation embedded, as in Python, JavaScript, etc.