Fix type inferencing and syntax highlighting of general property access

[eric-milles]

Consider the following:

class A {
  def getAttribute(String name) {
    "attribute $name"
  }
  def getProperty(String name) {
    "property $name"
  }
  def propertyMissing(name) {
    "missing $name"
  }
  def get(String name) {
    "general $name"
  }
  void test() {
    this.@xyz
    this.xyz
  }
}
class C {
  int xyz
  void test() {
    new A().with {
      xyz
    }
  }
}

Since A implements general attribute/property access mechanisms, the references "xyz" should indicate a declaring class of A.

[eric-milles]