Detect when assigning to a variable declared as component property

[mpaluchowski]

If a variable is declared as a component property and then assigned a value to, I would expect CFLint not to raise the issue of MISSING_VAR, which it currently does. Ie. for this code:

component {
  property name="foo" type="string";

  public void function bar() {
    foo = "baz";
  }
}

I'd expect no var-related issues.