Fix type inferencing and syntax highlighting for trait property references

[eric-milles]

Consider the following:

trait T {
  Number number
}

class C implements T {
  def m() {
    def n = number
    number = 'value'

    n = this.number
    this.number = 'value'

    n = getNumber()
    setNumber('value')

    n = T.super.number
    T.super.number = 'value'
  }
}

The property expressions "number" within C.m() are inconsistently highlighted (see below) and code hover shows C.getNumber() or C.setNumber(Number value) instead of T.number or T.getNumber() or T.setNumber(Number value).

[eric-milles]

[eric-milles]

[eric-milles]

References to properties within the trait itself have some issues as well:

"this" should not be selectable or highlighted as field. " = " should be highlighted as operator not field. Code select extends to trailing comments as well.

[eric-milles]

[eric-milles]