See if we can generate Haxe getters/setters

[jeremyfa]

It would be nice to get rid of java-style getVar() setVar() accessors as Haxe can handle properties with custom getters and setters.

That said we would still want to keep the java style accessor available to keep parity with official runtime (but make them totally optional) and ensure converted code doesn't call a getter/setter when it expect to access the underlying variable directly.