Fix type inferencing and syntax highlighting for constructor and static metaclass properties

[eric-milles]

Consider the following:

String.metaClass.constructor << { a, b, c ->
  "$a $b $c".toString()
}
String.getMetaClass().static.method = { ->
  println 'method called'
}

print new String('x','y','z')
String.method()

The special metaclass properties "constructor" and "static" don't provide any feedback that they are recognized.

[eric-milles]