[FEATURE] Add support for Function Bindings

[Starexify]

In haxe, we can use for/while loops on maps to fill them (as documented in the Haxe Manual.

So we have this example code (comments match haxe behavior):

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

In polymod this isn't supported and errors with the following errors:

 ERROR  Error while executing function WorstCParser.onCreate()#0:
Tried to access "_", but it is not a valid field or method.
 ERROR  Error while executing function WorstCParser.onCreate()#8:
Tried to access "bind", but it is not a valid field or method.