[BUGFIX/FEATURE] Wildcard Function Binds

[nykwono]

Fixes #327

This PR adds support for wildcards to be used when using the bind() function.

How it works

When using _, normally it throws an error as _ isn't a variable, to circumvent it, it simply checks if we're inside a bind function and notes that this is a wildcard.
Later, when the bind function is actually called, the arguments are then evaluated to account for any wildcards and replaces them with the necessary value.

override public function onCreate(event:ScriptEvent)
{
  var map = new IntMap();
  var f = map.set.bind(_, "12");

  f(1);
  f(2);
  f(3);
  trace(map.get(1)); // 12
  trace(map.get(2)); // 12
  trace(map.get(3)); // 12
}

hscriptClass(assets/ui/TestScript.hxc):19: 12
hscriptClass(assets/ui/TestScript.hxc):20: 12
hscriptClass(assets/ui/TestScript.hxc):21: 12